- \n
- Th\u1ef1c th\u1ec3: \u0111\u01b0\u1ee3c bi\u1ec3u di\u1ec5n b\u1eb1ng h\u00ecnh ch\u1eef nh\u1eadt v\u1edbi t\u00ean th\u1ef1c th\u1ec3 \u0111\u01b0\u1ee3c vi\u1ebft b\u00ean trong.<\/li>\n
- Thu\u1ed9c t\u00ednh: \u0111\u01b0\u1ee3c bi\u1ec3u di\u1ec5n b\u1eb1ng h\u00ecnh elip k\u1ebft n\u1ed1i v\u1edbi th\u1ef1c th\u1ec3 m\u00e0 n\u00f3 thu\u1ed9c v\u1ec1 b\u1eb1ng m\u1ed9t \u0111\u01b0\u1eddng th\u1eb3ng.<\/li>\n
- M\u1ed1i quan h\u1ec7: \u0111\u01b0\u1ee3c bi\u1ec3u di\u1ec5n b\u1eb1ng h\u00ecnh thoi k\u1ebft n\u1ed1i c\u00e1c th\u1ef1c th\u1ec3.<\/li>\n<\/ol>\n
Ba lo\u1ea1i m\u1ed1i quan h\u1ec7 c\u00f3 th\u1ec3 t\u1ed3n t\u1ea1i gi\u1eefa c\u00e1c th\u1ef1c th\u1ec3 l\u00e0:<\/p>\n
- \n
- M\u1ed9t-\u0111\u1ed1i-m\u1ed9t (1:1): n\u01a1i m\u1ed9t th\u1ec3 hi\u1ec7n c\u1ee7a m\u1ed9t th\u1ef1c th\u1ec3 \u0111\u01b0\u1ee3c li\u00ean k\u1ebft v\u1edbi m\u1ed9t th\u1ec3 hi\u1ec7n c\u1ee7a th\u1ef1c th\u1ec3 kh\u00e1c.<\/li>\n
- M\u1ed9t-\u0111\u1ed1i-nhi\u1ec1u (1:N): n\u01a1i m\u1ed9t th\u1ec3 hi\u1ec7n c\u1ee7a m\u1ed9t th\u1ef1c th\u1ec3 \u0111\u01b0\u1ee3c li\u00ean k\u1ebft v\u1edbi nhi\u1ec1u th\u1ec3 hi\u1ec7n c\u1ee7a th\u1ef1c th\u1ec3 kh\u00e1c.<\/li>\n
- Nhi\u1ec1u-\u0111\u1ed1i-nhi\u1ec1u (N:M): n\u01a1i nhi\u1ec1u th\u1ec3 hi\u1ec7n c\u1ee7a m\u1ed9t th\u1ef1c th\u1ec3 \u0111\u01b0\u1ee3c li\u00ean k\u1ebft v\u1edbi nhi\u1ec1u th\u1ec3 hi\u1ec7n c\u1ee7a th\u1ef1c th\u1ec3 kh\u00e1c.<\/li>\n<\/ol>\n
V\u00ed d\u1ee5 v\u1ec1 m\u00f4 h\u00ecnh h\u00f3a d\u1eef li\u1ec7u s\u1eed d\u1ee5ng ERD<\/h2>\n
H\u00e3y c\u00f9ng xem x\u00e9t m\u1ed9t v\u00ed d\u1ee5 v\u1ec1 m\u1ed9t c\u1eeda h\u00e0ng s\u00e1ch tr\u1ef1c tuy\u1ebfn b\u00e1n s\u00e1ch cho kh\u00e1ch h\u00e0ng. C\u1eeda h\u00e0ng s\u00e1ch c\u00f3 nhi\u1ec1u th\u1ec3 lo\u1ea1i s\u00e1ch v\u00e0 m\u1ed9t l\u01b0\u1ee3ng l\u1edbn kh\u00e1ch h\u00e0ng c\u00f3 th\u1ec3 \u0111\u1eb7t \u0111\u01a1n h\u00e0ng. \u0110\u1ec3 m\u00f4 h\u00ecnh h\u00f3a h\u1ec7 th\u1ed1ng n\u00e0y b\u1eb1ng ERD, ch\u00fang ta c\u00f3 th\u1ec3 b\u1eaft \u0111\u1ea7u b\u1eb1ng vi\u1ec7c x\u00e1c \u0111\u1ecbnh c\u00e1c th\u1ef1c th\u1ec3, thu\u1ed9c t\u00ednh v\u00e0 m\u1ed1i quan h\u1ec7 li\u00ean quan.<\/p>\n
C\u00e1c th\u1ef1c th\u1ec3:<\/strong><\/p>\n
- \n
- S\u00e1ch: Bi\u1ec3u di\u1ec5n m\u1ed9t cu\u1ed1n s\u00e1ch trong c\u1eeda h\u00e0ng s\u00e1ch. Ch\u1ee9a c\u00e1c thu\u1ed9c t\u00ednh nh\u01b0 ti\u00eau \u0111\u1ec1, t\u00e1c gi\u1ea3, ISBN v\u00e0 gi\u00e1.<\/li>\n
- Th\u1ec3 lo\u1ea1i: Bi\u1ec3u di\u1ec5n m\u1ed9t th\u1ec3 lo\u1ea1i ho\u1eb7c th\u1ec3 lo\u1ea1i s\u00e1ch trong c\u1eeda h\u00e0ng s\u00e1ch. Ch\u1ee9a c\u00e1c thu\u1ed9c t\u00ednh nh\u01b0 t\u00ean v\u00e0 m\u00f4 t\u1ea3.<\/li>\n
- Kh\u00e1ch h\u00e0ng: Bi\u1ec3u di\u1ec5n m\u1ed9t kh\u00e1ch h\u00e0ng \u0111\u00e3 \u0111\u0103ng k\u00fd t\u1ea1i c\u1eeda h\u00e0ng s\u00e1ch. Ch\u1ee9a c\u00e1c thu\u1ed9c t\u00ednh nh\u01b0 t\u00ean, \u0111\u1ecba ch\u1ec9 v\u00e0 email.<\/li>\n
- \u0110\u01a1n h\u00e0ng: Bi\u1ec3u di\u1ec5n m\u1ed9t \u0111\u01a1n h\u00e0ng do kh\u00e1ch h\u00e0ng \u0111\u1eb7t. Ch\u1ee9a c\u00e1c thu\u1ed9c t\u00ednh nh\u01b0 ng\u00e0y \u0111\u1eb7t h\u00e0ng v\u00e0 t\u1ed5ng gi\u00e1. C\u0169ng c\u00f3 tham chi\u1ebfu kh\u00f3a ngo\u1ea1i \u0111\u1ebfn th\u1ef1c th\u1ec3 Kh\u00e1ch h\u00e0ng, cho bi\u1ebft kh\u00e1ch h\u00e0ng n\u00e0o \u0111\u00e3 \u0111\u1eb7t \u0111\u01a1n h\u00e0ng.<\/li>\n
- S\u00e1ch_Th\u1ec3 lo\u1ea1i: Bi\u1ec3u di\u1ec5n m\u1ed1i quan h\u1ec7 nhi\u1ec1u-\u0111\u1ed1i-nhi\u1ec1u gi\u1eefa s\u00e1ch v\u00e0 th\u1ec3 lo\u1ea1i. Ch\u1ee9a c\u00e1c tham chi\u1ebfu kh\u00f3a ngo\u1ea1i \u0111\u1ebfn c\u1ea3 th\u1ef1c th\u1ec3 S\u00e1ch v\u00e0 Th\u1ec3 lo\u1ea1i.<\/li>\n
- \u0110\u01a1n_h\u00e0ng_S\u00e1ch: Bi\u1ec3u di\u1ec5n m\u1ed1i quan h\u1ec7 nhi\u1ec1u-\u0111\u1ed1i-nhi\u1ec1u gi\u1eefa \u0111\u01a1n h\u00e0ng v\u00e0 s\u00e1ch. Ch\u1ee9a c\u00e1c tham chi\u1ebfu kh\u00f3a ngo\u1ea1i \u0111\u1ebfn c\u1ea3 th\u1ef1c th\u1ec3 \u0110\u01a1n_h\u00e0ng v\u00e0 S\u00e1ch.<\/li>\n<\/ol>\n
C\u00e1c m\u1ed1i quan h\u1ec7:<\/strong><\/p>\n
- \n
- M\u1ed9t cu\u1ed1n s\u00e1ch c\u00f3 th\u1ec3 thu\u1ed9c v\u1ec1 nhi\u1ec1u th\u1ec3 lo\u1ea1i (Nhi\u1ec1u-\u0111\u1ed1i-nhi\u1ec1u).<\/li>\n
- M\u1ed9t th\u1ec3 lo\u1ea1i c\u00f3 th\u1ec3 c\u00f3 nhi\u1ec1u s\u00e1ch (M\u1ed9t-\u0111\u1ed1i-nhi\u1ec1u).<\/li>\n
- M\u1ed9t kh\u00e1ch h\u00e0ng c\u00f3 th\u1ec3 \u0111\u1eb7t nhi\u1ec1u \u0111\u01a1n h\u00e0ng (M\u1ed9t-\u0111\u1ed1i-nhi\u1ec1u).<\/li>\n
- M\u1ed9t \u0111\u01a1n h\u00e0ng c\u00f3 th\u1ec3 ch\u1ee9a nhi\u1ec1u s\u00e1ch (Nhi\u1ec1u-\u0111\u1ed1i-nhi\u1ec1u).<\/li>\n<\/ul>\n
V\u1edbi c\u00e1c th\u1ef1c th\u1ec3, thu\u1ed9c t\u00ednh v\u00e0 m\u1ed1i quan h\u1ec7 n\u00e0y trong t\u00e2m tr\u00ed, ch\u00fang ta c\u00f3 th\u1ec3 t\u1ea1o m\u1ed9t ERD cho h\u1ec7 th\u1ed1ng c\u1eeda h\u00e0ng s\u00e1ch tr\u1ef1c tuy\u1ebfn. ERD s\u1ebd tr\u00f4ng gi\u1ed1ng nh\u01b0 sau:<\/p>\n
![\"ERD](\"https:\/\/guides.visual-paradigm.com\/wp-content\/uploads\/2023\/03\/ERD-for-bookstore.png\")
<\/p>\nTrong s\u01a1 \u0111\u1ed3 ERD n\u00e0y, ch\u00fang ta c\u00f3 th\u1ec3 th\u1ea5y r\u1eb1ng th\u1ef1c th\u1ec3 S\u00e1ch c\u00f3 m\u1ed1i quan h\u1ec7 nhi\u1ec1u-\u0111\u1ed1i-nhi\u1ec1u v\u1edbi th\u1ef1c th\u1ec3 Th\u1ec3 lo\u1ea1i, \u0111i\u1ec1u \u0111\u00f3 c\u00f3 ngh\u0129a l\u00e0 m\u1ed9t cu\u1ed1n s\u00e1ch c\u00f3 th\u1ec3 thu\u1ed9c v\u1ec1 nhi\u1ec1u th\u1ec3 lo\u1ea1i, v\u00e0 m\u1ed9t th\u1ec3 lo\u1ea1i c\u00f3 th\u1ec3 c\u00f3 nhi\u1ec1u s\u00e1ch. Th\u1ef1c th\u1ec3 Kh\u00e1ch h\u00e0ng c\u00f3 m\u1ed1i quan h\u1ec7 m\u1ed9t-\u0111\u1ed1i-nhi\u1ec1u v\u1edbi th\u1ef1c th\u1ec3 \u0110\u01a1n_h\u00e0ng, \u0111i\u1ec1u \u0111\u00f3 c\u00f3 ngh\u0129a l\u00e0 m\u1ed9t kh\u00e1ch h\u00e0ng c\u00f3 th\u1ec3 \u0111\u1eb7t nhi\u1ec1u \u0111\u01a1n h\u00e0ng, nh\u01b0ng m\u1ed7i \u0111\u01a1n h\u00e0ng ch\u1ec9 thu\u1ed9c v\u1ec1 m\u1ed9t kh\u00e1ch h\u00e0ng. Cu\u1ed1i c\u00f9ng, th\u1ef1c th\u1ec3 \u0110\u01a1n_h\u00e0ng c\u00f3 m\u1ed1i quan h\u1ec7 nhi\u1ec1u-\u0111\u1ed1i-nhi\u1ec1u v\u1edbi th\u1ef1c th\u1ec3 S\u00e1ch, \u0111i\u1ec1u \u0111\u00f3 c\u00f3 ngh\u0129a l\u00e0 m\u1ed9t \u0111\u01a1n h\u00e0ng c\u00f3 th\u1ec3 ch\u1ee9a nhi\u1ec1u s\u00e1ch, v\u00e0 m\u1ed9t cu\u1ed1n s\u00e1ch c\u00f3 th\u1ec3 xu\u1ea5t hi\u1ec7n trong nhi\u1ec1u \u0111\u01a1n h\u00e0ng.<\/p>\n
T\u1ea1o m\u00e3 SQL l\u01b0\u1ee3c \u0111\u1ed3 c\u01a1 s\u1edf d\u1eef li\u1ec7u v\u1edbi Visual Paradigm<\/h3>\n
\n
B\u1ea3ng s\u00e1ch {
\nid int [kh\u00f3a ch\u00ednh, t\u0103ng d\u1ea7n]
\ntitle varchar
\nauthor varchar
\nisbn varchar
\nprice float
\n}<\/p>\nB\u1ea3ng category {
\nid int [kh\u00f3a ch\u00ednh, t\u0103ng d\u1ea7n]
\nname varchar
\ndescription varchar
\n}<\/p>\nB\u1ea3ng customer {
\nid int [kh\u00f3a ch\u00ednh, t\u0103ng d\u1ea7n]
\nname varchar
\naddress varchar
\nemail varchar
\n}<\/p>\nB\u1ea3ng order {
\nid int [kh\u00f3a ch\u00ednh, t\u0103ng d\u1ea7n]
\norder_date datetime
\ntotal_price float
\ncustomer_id int [tham chi\u1ebfu: > customer.id]
\n}<\/p>\nB\u1ea3ng book_category {
\nbook_id int [tham chi\u1ebfu: > book.id]
\ncategory_id int [tham chi\u1ebfu: > category.id]
\n}<\/p>\nB\u1ea3ng order_book {
\norder_id int [tham chi\u1ebfu: > order.id]
\nbook_id int [tham chi\u1ebfu: > book.id]
\n}<\/p>\n<\/blockquote>\nK\u1ebft lu\u1eadn<\/h2>\n
M\u00f4 h\u00ecnh h\u00f3a d\u1eef li\u1ec7u b\u1eb1ng s\u01a1 \u0111\u1ed3 ERD l\u00e0 m\u1ed9t qu\u00e1 tr\u00ecnh quan tr\u1ecdng gi\u00fap ch\u00fang ta h\u00ecnh dung v\u00e0 hi\u1ec3u r\u00f5 m\u1ed1i quan h\u1ec7 gi\u1eefa c\u00e1c th\u1ef1c th\u1ec3 trong c\u01a1 s\u1edf d\u1eef li\u1ec7u. B\u1eb1ng c\u00e1ch x\u00e1c \u0111\u1ecbnh c\u00e1c th\u1ef1c th\u1ec3, thu\u1ed9c t\u00ednh v\u00e0 m\u1ed1i quan h\u1ec7, ch\u00fang ta c\u00f3 th\u1ec3 t\u1ea1o ra m\u1ed9t s\u01a1 \u0111\u1ed3 ERD th\u1ec3 hi\u1ec7n d\u1eef li\u1ec7u v\u00e0 c\u1ea5u tr\u00fac c\u1ee7a n\u00f3 m\u1ed9t c\u00e1ch r\u00f5 r\u00e0ng v\u00e0 s\u00fac t\u00edch. \u0110i\u1ec1u n\u00e0y gi\u00fap ch\u00fang ta thi\u1ebft k\u1ebf v\u00e0 duy tr\u00ec c\u00e1c c\u01a1 s\u1edf d\u1eef li\u1ec7u hi\u1ec7u qu\u1ea3 v\u00e0 hi\u1ec7u su\u1ea5t cao, \u0111\u00e1p \u1ee9ng \u0111\u01b0\u1ee3c nhu c\u1ea7u c\u1ee7a t\u1ed5 ch\u1ee9c.<\/p>\n","protected":false},"excerpt":{"rendered":"
M\u00f4 h\u00ecnh h\u00f3a d\u1eef li\u1ec7u l\u00e0 qu\u00e1 tr\u00ecnh t\u1ea1o ra m\u1ed9t bi\u1ec3u di\u1ec5n tr\u1ef1c quan v\u1ec1 d\u1eef li\u1ec7u v\u00e0 c\u00e1c m\u1ed1i quan h\u1ec7 c\u1ee7a ch\u00fang trong c\u01a1 s\u1edf d\u1eef li\u1ec7u. M\u1ed9t trong nh\u1eefng c\u00f4ng c\u1ee5 th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng nh\u1ea5t \u0111\u1ec3 m\u00f4 h\u00ecnh h\u00f3a d\u1eef li\u1ec7u l\u00e0 s\u01a1 \u0111\u1ed3 quan h\u1ec7 th\u1ef1c th\u1ec3 (ERD), s\u1eed d\u1ee5ng c\u00e1c k\u00fd hi\u1ec7u \u0111\u1ed3 h\u1ecda \u0111\u1ec3 bi\u1ec3u di\u1ec5n c\u00e1c th\u1ef1c th\u1ec3, thu\u1ed9c t\u00ednh v\u00e0 m\u1ed1i quan h\u1ec7. Trong b\u00e0i vi\u1ebft n\u00e0y, ch\u00fang ta s\u1ebd kh\u00e1m ph\u00e1 quy tr\u00ecnh m\u00f4 h\u00ecnh h\u00f3a d\u1eef li\u1ec7u b\u1eb1ng ERD v\u00e0 cung c\u1ea5p c\u00e1c v\u00ed d\u1ee5 v\u1ec1 c\u00e1ch n\u00f3 c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e1c t\u00ecnh hu\u1ed1ng th\u1ef1c t\u1ebf. S\u01a1 \u0111\u1ed3 quan h\u1ec7 th\u1ef1c th\u1ec3 (ERD) l\u00e0 g\u00ec? ERD l\u00e0 m\u1ed9t bi\u1ec3u di\u1ec5n \u0111\u1ed3 h\u1ecda v\u1ec1 c\u00e1c th\u1ef1c th\u1ec3, thu\u1ed9c t\u00ednh c\u1ee7a ch\u00fang v\u00e0 m\u1ed1i quan h\u1ec7 gi\u1eefa ch\u00fang. C\u00e1c th\u1ef1c th\u1ec3 l\u00e0 c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng ho\u1eb7c kh\u00e1i ni\u1ec7m \u0111\u01b0\u1ee3c bi\u1ec3u di\u1ec5n trong c\u01a1 s\u1edf d\u1eef li\u1ec7u, ch\u1eb3ng h\u1ea1n nh\u01b0 kh\u00e1ch h\u00e0ng, \u0111\u01a1n h\u00e0ng ho\u1eb7c s\u1ea3n ph\u1ea9m. C\u00e1c thu\u1ed9c t\u00ednh l\u00e0 \u0111\u1eb7c \u0111i\u1ec3m ho\u1eb7c thu\u1ed9c t\u00ednh c\u1ee7a c\u00e1c th\u1ef1c th\u1ec3, ch\u1eb3ng h\u1ea1n nh\u01b0 t\u00ean, \u0111\u1ecba ch\u1ec9 ho\u1eb7c gi\u00e1. C\u00e1c m\u1ed1i quan h\u1ec7 l\u00e0 c\u00e1c li\u00ean k\u1ebft gi\u1eefa c\u00e1c th\u1ef1c th\u1ec3, ch\u1eb3ng h\u1ea1n nh\u01b0 m\u1ed9t kh\u00e1ch h\u00e0ng \u0111\u1eb7t m\u1ed9t \u0111\u01a1n h\u00e0ng. ERD th\u01b0\u1eddng bao g\u1ed3m c\u00e1c th\u00e0nh ph\u1ea7n sau: Th\u1ef1c th\u1ec3: \u0111\u01b0\u1ee3c bi\u1ec3u di\u1ec5n b\u1eb1ng h\u00ecnh ch\u1eef nh\u1eadt v\u1edbi t\u00ean th\u1ef1c th\u1ec3 \u0111\u01b0\u1ee3c vi\u1ebft b\u00ean trong. Thu\u1ed9c t\u00ednh: \u0111\u01b0\u1ee3c bi\u1ec3u di\u1ec5n b\u1eb1ng h\u00ecnh elip k\u1ebft n\u1ed1i v\u1edbi th\u1ef1c th\u1ec3 m\u00e0 n\u00f3 thu\u1ed9c v\u1ec1 b\u1eb1ng m\u1ed9t \u0111\u01b0\u1eddng th\u1eb3ng. M\u1ed1i quan h\u1ec7: \u0111\u01b0\u1ee3c bi\u1ec3u di\u1ec5n b\u1eb1ng h\u00ecnh thoi k\u1ebft n\u1ed1i c\u00e1c th\u1ef1c th\u1ec3. Ba lo\u1ea1i m\u1ed1i quan h\u1ec7 c\u00f3 th\u1ec3 t\u1ed3n t\u1ea1i gi\u1eefa c\u00e1c th\u1ef1c th\u1ec3 l\u00e0: M\u1ed9t-\u0111\u1ed1i-m\u1ed9t (1:1): n\u01a1i m\u1ed9t th\u1ec3 hi\u1ec7n c\u1ee7a m\u1ed9t th\u1ef1c th\u1ec3 \u0111\u01b0\u1ee3c li\u00ean k\u1ebft v\u1edbi m\u1ed9t th\u1ec3 hi\u1ec7n c\u1ee7a th\u1ef1c th\u1ec3 kh\u00e1c. M\u1ed9t-\u0111\u1ed1i-nhi\u1ec1u (1:N): n\u01a1i m\u1ed9t th\u1ec3 hi\u1ec7n c\u1ee7a m\u1ed9t th\u1ef1c th\u1ec3 \u0111\u01b0\u1ee3c li\u00ean k\u1ebft v\u1edbi nhi\u1ec1u th\u1ec3 hi\u1ec7n c\u1ee7a th\u1ef1c th\u1ec3 kh\u00e1c. Nhi\u1ec1u-\u0111\u1ed1i-nhi\u1ec1u (N:M): n\u01a1i nhi\u1ec1u th\u1ec3 hi\u1ec7n c\u1ee7a m\u1ed9t th\u1ef1c th\u1ec3 \u0111\u01b0\u1ee3c li\u00ean k\u1ebft v\u1edbi nhi\u1ec1u th\u1ec3 hi\u1ec7n c\u1ee7a th\u1ef1c th\u1ec3 kh\u00e1c. V\u00ed d\u1ee5 v\u1ec1 m\u00f4 h\u00ecnh h\u00f3a d\u1eef li\u1ec7u s\u1eed d\u1ee5ng ERD H\u00e3y c\u00f9ng xem x\u00e9t m\u1ed9t v\u00ed d\u1ee5 v\u1ec1 m\u1ed9t c\u1eeda h\u00e0ng s\u00e1ch tr\u1ef1c tuy\u1ebfn b\u00e1n s\u00e1ch cho kh\u00e1ch h\u00e0ng. C\u1eeda h\u00e0ng s\u00e1ch c\u00f3 nhi\u1ec1u th\u1ec3 lo\u1ea1i s\u00e1ch v\u00e0 m\u1ed9t l\u01b0\u1ee3ng l\u1edbn kh\u00e1ch h\u00e0ng c\u00f3 th\u1ec3 \u0111\u1eb7t \u0111\u01a1n h\u00e0ng. \u0110\u1ec3 m\u00f4 h\u00ecnh h\u00f3a h\u1ec7 th\u1ed1ng n\u00e0y b\u1eb1ng ERD, ch\u00fang ta c\u00f3 th\u1ec3 b\u1eaft \u0111\u1ea7u b\u1eb1ng vi\u1ec7c x\u00e1c \u0111\u1ecbnh c\u00e1c th\u1ef1c th\u1ec3, thu\u1ed9c t\u00ednh v\u00e0 m\u1ed1i quan h\u1ec7 li\u00ean quan. C\u00e1c th\u1ef1c th\u1ec3: S\u00e1ch: Bi\u1ec3u di\u1ec5n m\u1ed9t cu\u1ed1n s\u00e1ch trong c\u1eeda h\u00e0ng s\u00e1ch. Ch\u1ee9a c\u00e1c thu\u1ed9c t\u00ednh nh\u01b0 ti\u00eau \u0111\u1ec1, t\u00e1c gi\u1ea3, ISBN v\u00e0 gi\u00e1. Th\u1ec3 lo\u1ea1i: Bi\u1ec3u di\u1ec5n m\u1ed9t th\u1ec3 lo\u1ea1i ho\u1eb7c th\u1ec3 lo\u1ea1i s\u00e1ch trong c\u1eeda h\u00e0ng s\u00e1ch. Ch\u1ee9a c\u00e1c thu\u1ed9c t\u00ednh nh\u01b0 t\u00ean v\u00e0 m\u00f4 t\u1ea3. Kh\u00e1ch h\u00e0ng: Bi\u1ec3u di\u1ec5n m\u1ed9t kh\u00e1ch h\u00e0ng \u0111\u00e3 \u0111\u0103ng k\u00fd t\u1ea1i c\u1eeda h\u00e0ng s\u00e1ch. Ch\u1ee9a c\u00e1c thu\u1ed9c t\u00ednh nh\u01b0 t\u00ean, \u0111\u1ecba ch\u1ec9 v\u00e0 email. \u0110\u01a1n h\u00e0ng: Bi\u1ec3u di\u1ec5n m\u1ed9t \u0111\u01a1n h\u00e0ng do kh\u00e1ch h\u00e0ng \u0111\u1eb7t. Ch\u1ee9a c\u00e1c thu\u1ed9c t\u00ednh nh\u01b0 ng\u00e0y \u0111\u1eb7t h\u00e0ng v\u00e0 t\u1ed5ng gi\u00e1. C\u0169ng c\u00f3 tham chi\u1ebfu kh\u00f3a ngo\u1ea1i \u0111\u1ebfn th\u1ef1c th\u1ec3 Kh\u00e1ch h\u00e0ng, cho bi\u1ebft kh\u00e1ch h\u00e0ng n\u00e0o \u0111\u00e3 \u0111\u1eb7t \u0111\u01a1n h\u00e0ng. S\u00e1ch_Th\u1ec3 lo\u1ea1i: Bi\u1ec3u di\u1ec5n m\u1ed1i quan h\u1ec7 nhi\u1ec1u-\u0111\u1ed1i-nhi\u1ec1u gi\u1eefa s\u00e1ch v\u00e0 th\u1ec3 lo\u1ea1i. Ch\u1ee9a c\u00e1c tham chi\u1ebfu kh\u00f3a ngo\u1ea1i \u0111\u1ebfn c\u1ea3 th\u1ef1c th\u1ec3 S\u00e1ch v\u00e0 Th\u1ec3 lo\u1ea1i. \u0110\u01a1n_h\u00e0ng_S\u00e1ch: Bi\u1ec3u di\u1ec5n m\u1ed1i quan h\u1ec7 nhi\u1ec1u-\u0111\u1ed1i-nhi\u1ec1u gi\u1eefa \u0111\u01a1n h\u00e0ng v\u00e0 s\u00e1ch. Ch\u1ee9a c\u00e1c tham chi\u1ebfu kh\u00f3a ngo\u1ea1i \u0111\u1ebfn c\u1ea3 th\u1ef1c th\u1ec3 \u0110\u01a1n_h\u00e0ng v\u00e0 S\u00e1ch. C\u00e1c m\u1ed1i quan h\u1ec7: M\u1ed9t cu\u1ed1n s\u00e1ch c\u00f3 th\u1ec3 thu\u1ed9c v\u1ec1 nhi\u1ec1u th\u1ec3 lo\u1ea1i (Nhi\u1ec1u-\u0111\u1ed1i-nhi\u1ec1u). M\u1ed9t th\u1ec3 lo\u1ea1i c\u00f3 th\u1ec3 c\u00f3 nhi\u1ec1u s\u00e1ch (M\u1ed9t-\u0111\u1ed1i-nhi\u1ec1u). M\u1ed9t kh\u00e1ch h\u00e0ng c\u00f3 th\u1ec3 \u0111\u1eb7t nhi\u1ec1u \u0111\u01a1n h\u00e0ng (M\u1ed9t-\u0111\u1ed1i-nhi\u1ec1u). M\u1ed9t \u0111\u01a1n h\u00e0ng c\u00f3 th\u1ec3 ch\u1ee9a nhi\u1ec1u s\u00e1ch (Nhi\u1ec1u-\u0111\u1ed1i-nhi\u1ec1u). V\u1edbi c\u00e1c th\u1ef1c th\u1ec3, thu\u1ed9c t\u00ednh v\u00e0 m\u1ed1i quan h\u1ec7 n\u00e0y trong t\u00e2m tr\u00ed, ch\u00fang ta c\u00f3 th\u1ec3 t\u1ea1o m\u1ed9t ERD cho h\u1ec7 th\u1ed1ng c\u1eeda h\u00e0ng s\u00e1ch tr\u1ef1c tuy\u1ebfn. ERD s\u1ebd tr\u00f4ng gi\u1ed1ng nh\u01b0 sau: Trong s\u01a1 \u0111\u1ed3 ERD n\u00e0y, ch\u00fang ta c\u00f3 th\u1ec3 th\u1ea5y r\u1eb1ng th\u1ef1c th\u1ec3 S\u00e1ch c\u00f3 m\u1ed1i quan h\u1ec7 nhi\u1ec1u-\u0111\u1ed1i-nhi\u1ec1u v\u1edbi th\u1ef1c th\u1ec3 Th\u1ec3 lo\u1ea1i, \u0111i\u1ec1u \u0111\u00f3 c\u00f3 ngh\u0129a l\u00e0 m\u1ed9t cu\u1ed1n s\u00e1ch c\u00f3 th\u1ec3 thu\u1ed9c v\u1ec1 nhi\u1ec1u th\u1ec3 lo\u1ea1i, v\u00e0 m\u1ed9t th\u1ec3 lo\u1ea1i c\u00f3 th\u1ec3 c\u00f3 nhi\u1ec1u s\u00e1ch. Th\u1ef1c th\u1ec3 Kh\u00e1ch h\u00e0ng c\u00f3 m\u1ed1i quan h\u1ec7 m\u1ed9t-\u0111\u1ed1i-nhi\u1ec1u v\u1edbi th\u1ef1c th\u1ec3 \u0110\u01a1n_h\u00e0ng, \u0111i\u1ec1u \u0111\u00f3 c\u00f3 ngh\u0129a l\u00e0 m\u1ed9t kh\u00e1ch h\u00e0ng c\u00f3 th\u1ec3 \u0111\u1eb7t nhi\u1ec1u \u0111\u01a1n h\u00e0ng, nh\u01b0ng m\u1ed7i \u0111\u01a1n h\u00e0ng ch\u1ec9 thu\u1ed9c v\u1ec1 m\u1ed9t kh\u00e1ch h\u00e0ng. Cu\u1ed1i c\u00f9ng, th\u1ef1c th\u1ec3 \u0110\u01a1n_h\u00e0ng c\u00f3 m\u1ed1i quan h\u1ec7 nhi\u1ec1u-\u0111\u1ed1i-nhi\u1ec1u v\u1edbi th\u1ef1c th\u1ec3 S\u00e1ch, \u0111i\u1ec1u \u0111\u00f3 c\u00f3 ngh\u0129a l\u00e0 m\u1ed9t \u0111\u01a1n h\u00e0ng c\u00f3 th\u1ec3 ch\u1ee9a nhi\u1ec1u s\u00e1ch, v\u00e0 m\u1ed9t cu\u1ed1n s\u00e1ch c\u00f3 th\u1ec3 xu\u1ea5t hi\u1ec7n trong nhi\u1ec1u \u0111\u01a1n h\u00e0ng. T\u1ea1o m\u00e3 SQL l\u01b0\u1ee3c \u0111\u1ed3 c\u01a1 s\u1edf d\u1eef li\u1ec7u v\u1edbi Visual Paradigm B\u1ea3ng s\u00e1ch { id int [kh\u00f3a ch\u00ednh, t\u0103ng d\u1ea7n] title varchar author varchar isbn varchar price float } B\u1ea3ng category { id int [kh\u00f3a ch\u00ednh, t\u0103ng d\u1ea7n] name varchar description varchar } B\u1ea3ng customer { id int [kh\u00f3a ch\u00ednh, t\u0103ng d\u1ea7n] name varchar address varchar email varchar } B\u1ea3ng order { id int [kh\u00f3a ch\u00ednh, t\u0103ng d\u1ea7n] order_date datetime total_price float customer_id int [tham chi\u1ebfu: > customer.id] } B\u1ea3ng book_category { book_id int [tham chi\u1ebfu: > book.id] category_id int [tham chi\u1ebfu: > category.id] } B\u1ea3ng order_book { order_id int [tham chi\u1ebfu: > order.id] book_id int [tham chi\u1ebfu: > book.id] } K\u1ebft lu\u1eadn M\u00f4 h\u00ecnh h\u00f3a d\u1eef li\u1ec7u b\u1eb1ng s\u01a1 \u0111\u1ed3 ERD l\u00e0 m\u1ed9t qu\u00e1 tr\u00ecnh quan tr\u1ecdng gi\u00fap ch\u00fang ta h\u00ecnh dung v\u00e0 hi\u1ec3u r\u00f5 m\u1ed1i quan h\u1ec7 gi\u1eefa c\u00e1c th\u1ef1c th\u1ec3 trong c\u01a1 s\u1edf d\u1eef li\u1ec7u. B\u1eb1ng c\u00e1ch x\u00e1c \u0111\u1ecbnh c\u00e1c th\u1ef1c th\u1ec3, thu\u1ed9c t\u00ednh v\u00e0 m\u1ed1i quan h\u1ec7, ch\u00fang ta c\u00f3 th\u1ec3 t\u1ea1o ra m\u1ed9t s\u01a1 \u0111\u1ed3 ERD th\u1ec3 hi\u1ec7n d\u1eef li\u1ec7u v\u00e0 c\u1ea5u tr\u00fac c\u1ee7a n\u00f3 m\u1ed9t c\u00e1ch r\u00f5 r\u00e0ng v\u00e0 s\u00fac t\u00edch. \u0110i\u1ec1u n\u00e0y gi\u00fap ch\u00fang ta thi\u1ebft k\u1ebf v\u00e0 duy tr\u00ec c\u00e1c c\u01a1 s\u1edf d\u1eefX\u00e2y d\u1ef1ng m\u1ed9t c\u1eeda h\u00e0ng s\u00e1ch tr\u1ef1c tuy\u1ebfn: M\u00f4 h\u00ecnh h\u00f3a d\u1eef li\u1ec7u v\u1edbi ERD v\u00e0 DBML<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":6754,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_title":"","_yoast_wpseo_metadesc":"","_eb_attr":"","neve_meta_sidebar":"","neve_meta_container":"","neve_meta_enable_content_width":"","neve_meta_content_width":0,"neve_meta_title_alignment":"","neve_meta_author_avatar":"","neve_post_elements_order":"","neve_meta_disable_header":"","neve_meta_disable_footer":"","neve_meta_disable_title":"","fifu_image_url":"","fifu_image_alt":"","footnotes":""},"categories":[17],"tags":[],"class_list":["post-6753","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-data-modeling-database"],"yoast_head":"\n
X\u00e2y d\u1ef1ng m\u1ed9t c\u1eeda h\u00e0ng s\u00e1ch tr\u1ef1c tuy\u1ebfn: M\u00f4 h\u00ecnh h\u00f3a d\u1eef li\u1ec7u v\u1edbi ERD v\u00e0 DBML - Visual Paradigm Guides Vietnamese<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/guides.visual-paradigm.com\/vn\/building-an-online-bookstore-data-modeling-with-erd-and-dbml\/\" \/>\n<meta property=\"og:locale\" content=\"vi_VN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"X\u00e2y d\u1ef1ng m\u1ed9t c\u1eeda h\u00e0ng s\u00e1ch tr\u1ef1c tuy\u1ebfn: M\u00f4 h\u00ecnh h\u00f3a d\u1eef li\u1ec7u v\u1edbi ERD v\u00e0 DBML - Visual Paradigm Guides Vietnamese\" \/>\n<meta property=\"og:description\" content=\"M\u00f4 h\u00ecnh h\u00f3a d\u1eef li\u1ec7u l\u00e0 qu\u00e1 tr\u00ecnh t\u1ea1o ra m\u1ed9t bi\u1ec3u di\u1ec5n tr\u1ef1c quan v\u1ec1 d\u1eef li\u1ec7u v\u00e0 c\u00e1c m\u1ed1i quan h\u1ec7 c\u1ee7a ch\u00fang trong c\u01a1 s\u1edf d\u1eef li\u1ec7u. M\u1ed9t trong nh\u1eefng c\u00f4ng c\u1ee5 th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng nh\u1ea5t \u0111\u1ec3 m\u00f4 h\u00ecnh h\u00f3a d\u1eef li\u1ec7u l\u00e0 s\u01a1 \u0111\u1ed3 quan h\u1ec7 th\u1ef1c th\u1ec3 (ERD), s\u1eed d\u1ee5ng c\u00e1c k\u00fd hi\u1ec7u \u0111\u1ed3 h\u1ecda \u0111\u1ec3 bi\u1ec3u di\u1ec5n c\u00e1c th\u1ef1c th\u1ec3, thu\u1ed9c t\u00ednh v\u00e0 m\u1ed1i quan h\u1ec7. Trong b\u00e0i vi\u1ebft n\u00e0y, ch\u00fang ta s\u1ebd kh\u00e1m ph\u00e1 quy tr\u00ecnh m\u00f4 h\u00ecnh h\u00f3a d\u1eef li\u1ec7u b\u1eb1ng ERD v\u00e0 cung c\u1ea5p c\u00e1c v\u00ed d\u1ee5 v\u1ec1 c\u00e1ch n\u00f3 c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e1c t\u00ecnh hu\u1ed1ng th\u1ef1c t\u1ebf. S\u01a1 \u0111\u1ed3 quan h\u1ec7 th\u1ef1c th\u1ec3 (ERD) l\u00e0 g\u00ec? ERD l\u00e0 m\u1ed9t bi\u1ec3u di\u1ec5n \u0111\u1ed3 h\u1ecda v\u1ec1 c\u00e1c th\u1ef1c th\u1ec3, thu\u1ed9c t\u00ednh c\u1ee7a ch\u00fang v\u00e0 m\u1ed1i quan h\u1ec7 gi\u1eefa ch\u00fang. C\u00e1c th\u1ef1c th\u1ec3 l\u00e0 c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng ho\u1eb7c kh\u00e1i ni\u1ec7m \u0111\u01b0\u1ee3c bi\u1ec3u di\u1ec5n trong c\u01a1 s\u1edf d\u1eef li\u1ec7u, ch\u1eb3ng h\u1ea1n nh\u01b0 kh\u00e1ch h\u00e0ng, \u0111\u01a1n h\u00e0ng ho\u1eb7c s\u1ea3n ph\u1ea9m. C\u00e1c thu\u1ed9c t\u00ednh l\u00e0 \u0111\u1eb7c \u0111i\u1ec3m ho\u1eb7c thu\u1ed9c t\u00ednh c\u1ee7a c\u00e1c th\u1ef1c th\u1ec3, ch\u1eb3ng h\u1ea1n nh\u01b0 t\u00ean, \u0111\u1ecba ch\u1ec9 ho\u1eb7c gi\u00e1. C\u00e1c m\u1ed1i quan h\u1ec7 l\u00e0 c\u00e1c li\u00ean k\u1ebft gi\u1eefa c\u00e1c th\u1ef1c th\u1ec3, ch\u1eb3ng h\u1ea1n nh\u01b0 m\u1ed9t kh\u00e1ch h\u00e0ng \u0111\u1eb7t m\u1ed9t \u0111\u01a1n h\u00e0ng. ERD th\u01b0\u1eddng bao g\u1ed3m c\u00e1c th\u00e0nh ph\u1ea7n sau: Th\u1ef1c th\u1ec3: \u0111\u01b0\u1ee3c bi\u1ec3u di\u1ec5n b\u1eb1ng h\u00ecnh ch\u1eef nh\u1eadt v\u1edbi t\u00ean th\u1ef1c th\u1ec3 \u0111\u01b0\u1ee3c vi\u1ebft b\u00ean trong. Thu\u1ed9c t\u00ednh: \u0111\u01b0\u1ee3c bi\u1ec3u di\u1ec5n b\u1eb1ng h\u00ecnh elip k\u1ebft n\u1ed1i v\u1edbi th\u1ef1c th\u1ec3 m\u00e0 n\u00f3 thu\u1ed9c v\u1ec1 b\u1eb1ng m\u1ed9t \u0111\u01b0\u1eddng th\u1eb3ng. M\u1ed1i quan h\u1ec7: \u0111\u01b0\u1ee3c bi\u1ec3u di\u1ec5n b\u1eb1ng h\u00ecnh thoi k\u1ebft n\u1ed1i c\u00e1c th\u1ef1c th\u1ec3. Ba lo\u1ea1i m\u1ed1i quan h\u1ec7 c\u00f3 th\u1ec3 t\u1ed3n t\u1ea1i gi\u1eefa c\u00e1c th\u1ef1c th\u1ec3 l\u00e0: M\u1ed9t-\u0111\u1ed1i-m\u1ed9t (1:1): n\u01a1i m\u1ed9t th\u1ec3 hi\u1ec7n c\u1ee7a m\u1ed9t th\u1ef1c th\u1ec3 \u0111\u01b0\u1ee3c li\u00ean k\u1ebft v\u1edbi m\u1ed9t th\u1ec3 hi\u1ec7n c\u1ee7a th\u1ef1c th\u1ec3 kh\u00e1c. M\u1ed9t-\u0111\u1ed1i-nhi\u1ec1u (1:N): n\u01a1i m\u1ed9t th\u1ec3 hi\u1ec7n c\u1ee7a m\u1ed9t th\u1ef1c th\u1ec3 \u0111\u01b0\u1ee3c li\u00ean k\u1ebft v\u1edbi nhi\u1ec1u th\u1ec3 hi\u1ec7n c\u1ee7a th\u1ef1c th\u1ec3 kh\u00e1c. Nhi\u1ec1u-\u0111\u1ed1i-nhi\u1ec1u (N:M): n\u01a1i nhi\u1ec1u th\u1ec3 hi\u1ec7n c\u1ee7a m\u1ed9t th\u1ef1c th\u1ec3 \u0111\u01b0\u1ee3c li\u00ean k\u1ebft v\u1edbi nhi\u1ec1u th\u1ec3 hi\u1ec7n c\u1ee7a th\u1ef1c th\u1ec3 kh\u00e1c. V\u00ed d\u1ee5 v\u1ec1 m\u00f4 h\u00ecnh h\u00f3a d\u1eef li\u1ec7u s\u1eed d\u1ee5ng ERD H\u00e3y c\u00f9ng xem x\u00e9t m\u1ed9t v\u00ed d\u1ee5 v\u1ec1 m\u1ed9t c\u1eeda h\u00e0ng s\u00e1ch tr\u1ef1c tuy\u1ebfn b\u00e1n s\u00e1ch cho kh\u00e1ch h\u00e0ng. C\u1eeda h\u00e0ng s\u00e1ch c\u00f3 nhi\u1ec1u th\u1ec3 lo\u1ea1i s\u00e1ch v\u00e0 m\u1ed9t l\u01b0\u1ee3ng l\u1edbn kh\u00e1ch h\u00e0ng c\u00f3 th\u1ec3 \u0111\u1eb7t \u0111\u01a1n h\u00e0ng. \u0110\u1ec3 m\u00f4 h\u00ecnh h\u00f3a h\u1ec7 th\u1ed1ng n\u00e0y b\u1eb1ng ERD, ch\u00fang ta c\u00f3 th\u1ec3 b\u1eaft \u0111\u1ea7u b\u1eb1ng vi\u1ec7c x\u00e1c \u0111\u1ecbnh c\u00e1c th\u1ef1c th\u1ec3, thu\u1ed9c t\u00ednh v\u00e0 m\u1ed1i quan h\u1ec7 li\u00ean quan. C\u00e1c th\u1ef1c th\u1ec3: S\u00e1ch: Bi\u1ec3u di\u1ec5n m\u1ed9t cu\u1ed1n s\u00e1ch trong c\u1eeda h\u00e0ng s\u00e1ch. Ch\u1ee9a c\u00e1c thu\u1ed9c t\u00ednh nh\u01b0 ti\u00eau \u0111\u1ec1, t\u00e1c gi\u1ea3, ISBN v\u00e0 gi\u00e1. Th\u1ec3 lo\u1ea1i: Bi\u1ec3u di\u1ec5n m\u1ed9t th\u1ec3 lo\u1ea1i ho\u1eb7c th\u1ec3 lo\u1ea1i s\u00e1ch trong c\u1eeda h\u00e0ng s\u00e1ch. Ch\u1ee9a c\u00e1c thu\u1ed9c t\u00ednh nh\u01b0 t\u00ean v\u00e0 m\u00f4 t\u1ea3. Kh\u00e1ch h\u00e0ng: Bi\u1ec3u di\u1ec5n m\u1ed9t kh\u00e1ch h\u00e0ng \u0111\u00e3 \u0111\u0103ng k\u00fd t\u1ea1i c\u1eeda h\u00e0ng s\u00e1ch. Ch\u1ee9a c\u00e1c thu\u1ed9c t\u00ednh nh\u01b0 t\u00ean, \u0111\u1ecba ch\u1ec9 v\u00e0 email. \u0110\u01a1n h\u00e0ng: Bi\u1ec3u di\u1ec5n m\u1ed9t \u0111\u01a1n h\u00e0ng do kh\u00e1ch h\u00e0ng \u0111\u1eb7t. Ch\u1ee9a c\u00e1c thu\u1ed9c t\u00ednh nh\u01b0 ng\u00e0y \u0111\u1eb7t h\u00e0ng v\u00e0 t\u1ed5ng gi\u00e1. C\u0169ng c\u00f3 tham chi\u1ebfu kh\u00f3a ngo\u1ea1i \u0111\u1ebfn th\u1ef1c th\u1ec3 Kh\u00e1ch h\u00e0ng, cho bi\u1ebft kh\u00e1ch h\u00e0ng n\u00e0o \u0111\u00e3 \u0111\u1eb7t \u0111\u01a1n h\u00e0ng. S\u00e1ch_Th\u1ec3 lo\u1ea1i: Bi\u1ec3u di\u1ec5n m\u1ed1i quan h\u1ec7 nhi\u1ec1u-\u0111\u1ed1i-nhi\u1ec1u gi\u1eefa s\u00e1ch v\u00e0 th\u1ec3 lo\u1ea1i. Ch\u1ee9a c\u00e1c tham chi\u1ebfu kh\u00f3a ngo\u1ea1i \u0111\u1ebfn c\u1ea3 th\u1ef1c th\u1ec3 S\u00e1ch v\u00e0 Th\u1ec3 lo\u1ea1i. \u0110\u01a1n_h\u00e0ng_S\u00e1ch: Bi\u1ec3u di\u1ec5n m\u1ed1i quan h\u1ec7 nhi\u1ec1u-\u0111\u1ed1i-nhi\u1ec1u gi\u1eefa \u0111\u01a1n h\u00e0ng v\u00e0 s\u00e1ch. Ch\u1ee9a c\u00e1c tham chi\u1ebfu kh\u00f3a ngo\u1ea1i \u0111\u1ebfn c\u1ea3 th\u1ef1c th\u1ec3 \u0110\u01a1n_h\u00e0ng v\u00e0 S\u00e1ch. C\u00e1c m\u1ed1i quan h\u1ec7: M\u1ed9t cu\u1ed1n s\u00e1ch c\u00f3 th\u1ec3 thu\u1ed9c v\u1ec1 nhi\u1ec1u th\u1ec3 lo\u1ea1i (Nhi\u1ec1u-\u0111\u1ed1i-nhi\u1ec1u). M\u1ed9t th\u1ec3 lo\u1ea1i c\u00f3 th\u1ec3 c\u00f3 nhi\u1ec1u s\u00e1ch (M\u1ed9t-\u0111\u1ed1i-nhi\u1ec1u). M\u1ed9t kh\u00e1ch h\u00e0ng c\u00f3 th\u1ec3 \u0111\u1eb7t nhi\u1ec1u \u0111\u01a1n h\u00e0ng (M\u1ed9t-\u0111\u1ed1i-nhi\u1ec1u). M\u1ed9t \u0111\u01a1n h\u00e0ng c\u00f3 th\u1ec3 ch\u1ee9a nhi\u1ec1u s\u00e1ch (Nhi\u1ec1u-\u0111\u1ed1i-nhi\u1ec1u). V\u1edbi c\u00e1c th\u1ef1c th\u1ec3, thu\u1ed9c t\u00ednh v\u00e0 m\u1ed1i quan h\u1ec7 n\u00e0y trong t\u00e2m tr\u00ed, ch\u00fang ta c\u00f3 th\u1ec3 t\u1ea1o m\u1ed9t ERD cho h\u1ec7 th\u1ed1ng c\u1eeda h\u00e0ng s\u00e1ch tr\u1ef1c tuy\u1ebfn. ERD s\u1ebd tr\u00f4ng gi\u1ed1ng nh\u01b0 sau: Trong s\u01a1 \u0111\u1ed3 ERD n\u00e0y, ch\u00fang ta c\u00f3 th\u1ec3 th\u1ea5y r\u1eb1ng th\u1ef1c th\u1ec3 S\u00e1ch c\u00f3 m\u1ed1i quan h\u1ec7 nhi\u1ec1u-\u0111\u1ed1i-nhi\u1ec1u v\u1edbi th\u1ef1c th\u1ec3 Th\u1ec3 lo\u1ea1i, \u0111i\u1ec1u \u0111\u00f3 c\u00f3 ngh\u0129a l\u00e0 m\u1ed9t cu\u1ed1n s\u00e1ch c\u00f3 th\u1ec3 thu\u1ed9c v\u1ec1 nhi\u1ec1u th\u1ec3 lo\u1ea1i, v\u00e0 m\u1ed9t th\u1ec3 lo\u1ea1i c\u00f3 th\u1ec3 c\u00f3 nhi\u1ec1u s\u00e1ch. Th\u1ef1c th\u1ec3 Kh\u00e1ch h\u00e0ng c\u00f3 m\u1ed1i quan h\u1ec7 m\u1ed9t-\u0111\u1ed1i-nhi\u1ec1u v\u1edbi th\u1ef1c th\u1ec3 \u0110\u01a1n_h\u00e0ng, \u0111i\u1ec1u \u0111\u00f3 c\u00f3 ngh\u0129a l\u00e0 m\u1ed9t kh\u00e1ch h\u00e0ng c\u00f3 th\u1ec3 \u0111\u1eb7t nhi\u1ec1u \u0111\u01a1n h\u00e0ng, nh\u01b0ng m\u1ed7i \u0111\u01a1n h\u00e0ng ch\u1ec9 thu\u1ed9c v\u1ec1 m\u1ed9t kh\u00e1ch h\u00e0ng. Cu\u1ed1i c\u00f9ng, th\u1ef1c th\u1ec3 \u0110\u01a1n_h\u00e0ng c\u00f3 m\u1ed1i quan h\u1ec7 nhi\u1ec1u-\u0111\u1ed1i-nhi\u1ec1u v\u1edbi th\u1ef1c th\u1ec3 S\u00e1ch, \u0111i\u1ec1u \u0111\u00f3 c\u00f3 ngh\u0129a l\u00e0 m\u1ed9t \u0111\u01a1n h\u00e0ng c\u00f3 th\u1ec3 ch\u1ee9a nhi\u1ec1u s\u00e1ch, v\u00e0 m\u1ed9t cu\u1ed1n s\u00e1ch c\u00f3 th\u1ec3 xu\u1ea5t hi\u1ec7n trong nhi\u1ec1u \u0111\u01a1n h\u00e0ng. T\u1ea1o m\u00e3 SQL l\u01b0\u1ee3c \u0111\u1ed3 c\u01a1 s\u1edf d\u1eef li\u1ec7u v\u1edbi Visual Paradigm B\u1ea3ng s\u00e1ch { id int [kh\u00f3a ch\u00ednh, t\u0103ng d\u1ea7n] title varchar author varchar isbn varchar price float } B\u1ea3ng category { id int [kh\u00f3a ch\u00ednh, t\u0103ng d\u1ea7n] name varchar description varchar } B\u1ea3ng customer { id int [kh\u00f3a ch\u00ednh, t\u0103ng d\u1ea7n] name varchar address varchar email varchar } B\u1ea3ng order { id int [kh\u00f3a ch\u00ednh, t\u0103ng d\u1ea7n] order_date datetime total_price float customer_id int [tham chi\u1ebfu: > customer.id] } B\u1ea3ng book_category { book_id int [tham chi\u1ebfu: > book.id] category_id int [tham chi\u1ebfu: > category.id] } B\u1ea3ng order_book { order_id int [tham chi\u1ebfu: > order.id] book_id int [tham chi\u1ebfu: > book.id] } K\u1ebft lu\u1eadn M\u00f4 h\u00ecnh h\u00f3a d\u1eef li\u1ec7u b\u1eb1ng s\u01a1 \u0111\u1ed3 ERD l\u00e0 m\u1ed9t qu\u00e1 tr\u00ecnh quan tr\u1ecdng gi\u00fap ch\u00fang ta h\u00ecnh dung v\u00e0 hi\u1ec3u r\u00f5 m\u1ed1i quan h\u1ec7 gi\u1eefa c\u00e1c th\u1ef1c th\u1ec3 trong c\u01a1 s\u1edf d\u1eef li\u1ec7u. B\u1eb1ng c\u00e1ch x\u00e1c \u0111\u1ecbnh c\u00e1c th\u1ef1c th\u1ec3, thu\u1ed9c t\u00ednh v\u00e0 m\u1ed1i quan h\u1ec7, ch\u00fang ta c\u00f3 th\u1ec3 t\u1ea1o ra m\u1ed9t s\u01a1 \u0111\u1ed3 ERD th\u1ec3 hi\u1ec7n d\u1eef li\u1ec7u v\u00e0 c\u1ea5u tr\u00fac c\u1ee7a n\u00f3 m\u1ed9t c\u00e1ch r\u00f5 r\u00e0ng v\u00e0 s\u00fac t\u00edch. \u0110i\u1ec1u n\u00e0y gi\u00fap ch\u00fang ta thi\u1ebft k\u1ebf v\u00e0 duy tr\u00ec c\u00e1c c\u01a1 s\u1edf d\u1eefX\u00e2y d\u1ef1ng m\u1ed9t c\u1eeda h\u00e0ng s\u00e1ch tr\u1ef1c tuy\u1ebfn: M\u00f4 h\u00ecnh h\u00f3a d\u1eef li\u1ec7u v\u1edbi ERD v\u00e0 DBML\" \/>\n<meta property=\"og:url\" content=\"https:\/\/guides.visual-paradigm.com\/vn\/building-an-online-bookstore-data-modeling-with-erd-and-dbml\/\" \/>\n<meta property=\"og:site_name\" content=\"Visual Paradigm Guides Vietnamese\" \/>\n<meta property=\"article:published_time\" content=\"2026-02-05T15:04:26+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/guides.visual-paradigm.com\/vn\/wp-content\/uploads\/sites\/10\/2026\/02\/ERD-for-bookstore.png\" \/>\n\t<meta property=\"og:image:width\" content=\"663\" \/>\n\t<meta property=\"og:image:height\" content=\"418\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u0110\u01b0\u1ee3c vi\u1ebft b\u1edfi\" \/>\n\t<meta name=\"twitter:data1\" content=\"vpadmin\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u01af\u1edbc t\u00ednh th\u1eddi gian \u0111\u1ecdc\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 ph\u00fat\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/guides.visual-paradigm.com\/vn\/building-an-online-bookstore-data-modeling-with-erd-and-dbml\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/guides.visual-paradigm.com\/vn\/building-an-online-bookstore-data-modeling-with-erd-and-dbml\/\"},\"headline\":\"X\u00e2y d\u1ef1ng m\u1ed9t c\u1eeda h\u00e0ng s\u00e1ch tr\u1ef1c tuy\u1ebfn: M\u00f4 h\u00ecnh h\u00f3a d\u1eef li\u1ec7u v\u1edbi ERD v\u00e0 DBML\",\"datePublished\":\"2026-02-05T15:04:26+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/guides.visual-paradigm.com\/vn\/building-an-online-bookstore-data-modeling-with-erd-and-dbml\/\"},\"wordCount\":1616,\"commentCount\":0,\"image\":{\"@id\":\"https:\/\/guides.visual-paradigm.com\/vn\/building-an-online-bookstore-data-modeling-with-erd-and-dbml\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/guides.visual-paradigm.com\/vn\/wp-content\/uploads\/sites\/10\/2026\/02\/ERD-for-bookstore.png\",\"articleSection\":[\"Data Modeling \/ Database\"],\"inLanguage\":\"vi\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/guides.visual-paradigm.com\/vn\/building-an-online-bookstore-data-modeling-with-erd-and-dbml\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/guides.visual-paradigm.com\/vn\/building-an-online-bookstore-data-modeling-with-erd-and-dbml\/\",\"url\":\"https:\/\/guides.visual-paradigm.com\/vn\/building-an-online-bookstore-data-modeling-with-erd-and-dbml\/\",\"name\":\"X\u00e2y d\u1ef1ng m\u1ed9t c\u1eeda h\u00e0ng s\u00e1ch tr\u1ef1c tuy\u1ebfn: M\u00f4 h\u00ecnh h\u00f3a d\u1eef li\u1ec7u v\u1edbi ERD v\u00e0 DBML - 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Visual Paradigm Guides Vietnamese","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/guides.visual-paradigm.com\/vn\/building-an-online-bookstore-data-modeling-with-erd-and-dbml\/","og_locale":"vi_VN","og_type":"article","og_title":"X\u00e2y d\u1ef1ng m\u1ed9t c\u1eeda h\u00e0ng s\u00e1ch tr\u1ef1c tuy\u1ebfn: M\u00f4 h\u00ecnh h\u00f3a d\u1eef li\u1ec7u v\u1edbi ERD v\u00e0 DBML - Visual Paradigm Guides Vietnamese","og_description":"M\u00f4 h\u00ecnh h\u00f3a d\u1eef li\u1ec7u l\u00e0 qu\u00e1 tr\u00ecnh t\u1ea1o ra m\u1ed9t bi\u1ec3u di\u1ec5n tr\u1ef1c quan v\u1ec1 d\u1eef li\u1ec7u v\u00e0 c\u00e1c m\u1ed1i quan h\u1ec7 c\u1ee7a ch\u00fang trong c\u01a1 s\u1edf d\u1eef li\u1ec7u. M\u1ed9t trong nh\u1eefng c\u00f4ng c\u1ee5 th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng nh\u1ea5t \u0111\u1ec3 m\u00f4 h\u00ecnh h\u00f3a d\u1eef li\u1ec7u l\u00e0 s\u01a1 \u0111\u1ed3 quan h\u1ec7 th\u1ef1c th\u1ec3 (ERD), s\u1eed d\u1ee5ng c\u00e1c k\u00fd hi\u1ec7u \u0111\u1ed3 h\u1ecda \u0111\u1ec3 bi\u1ec3u di\u1ec5n c\u00e1c th\u1ef1c th\u1ec3, thu\u1ed9c t\u00ednh v\u00e0 m\u1ed1i quan h\u1ec7. Trong b\u00e0i vi\u1ebft n\u00e0y, ch\u00fang ta s\u1ebd kh\u00e1m ph\u00e1 quy tr\u00ecnh m\u00f4 h\u00ecnh h\u00f3a d\u1eef li\u1ec7u b\u1eb1ng ERD v\u00e0 cung c\u1ea5p c\u00e1c v\u00ed d\u1ee5 v\u1ec1 c\u00e1ch n\u00f3 c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e1c t\u00ecnh hu\u1ed1ng th\u1ef1c t\u1ebf. S\u01a1 \u0111\u1ed3 quan h\u1ec7 th\u1ef1c th\u1ec3 (ERD) l\u00e0 g\u00ec? ERD l\u00e0 m\u1ed9t bi\u1ec3u di\u1ec5n \u0111\u1ed3 h\u1ecda v\u1ec1 c\u00e1c th\u1ef1c th\u1ec3, thu\u1ed9c t\u00ednh c\u1ee7a ch\u00fang v\u00e0 m\u1ed1i quan h\u1ec7 gi\u1eefa ch\u00fang. C\u00e1c th\u1ef1c th\u1ec3 l\u00e0 c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng ho\u1eb7c kh\u00e1i ni\u1ec7m \u0111\u01b0\u1ee3c bi\u1ec3u di\u1ec5n trong c\u01a1 s\u1edf d\u1eef li\u1ec7u, ch\u1eb3ng h\u1ea1n nh\u01b0 kh\u00e1ch h\u00e0ng, \u0111\u01a1n h\u00e0ng ho\u1eb7c s\u1ea3n ph\u1ea9m. C\u00e1c thu\u1ed9c t\u00ednh l\u00e0 \u0111\u1eb7c \u0111i\u1ec3m ho\u1eb7c thu\u1ed9c t\u00ednh c\u1ee7a c\u00e1c th\u1ef1c th\u1ec3, ch\u1eb3ng h\u1ea1n nh\u01b0 t\u00ean, \u0111\u1ecba ch\u1ec9 ho\u1eb7c gi\u00e1. C\u00e1c m\u1ed1i quan h\u1ec7 l\u00e0 c\u00e1c li\u00ean k\u1ebft gi\u1eefa c\u00e1c th\u1ef1c th\u1ec3, ch\u1eb3ng h\u1ea1n nh\u01b0 m\u1ed9t kh\u00e1ch h\u00e0ng \u0111\u1eb7t m\u1ed9t \u0111\u01a1n h\u00e0ng. ERD th\u01b0\u1eddng bao g\u1ed3m c\u00e1c th\u00e0nh ph\u1ea7n sau: Th\u1ef1c th\u1ec3: \u0111\u01b0\u1ee3c bi\u1ec3u di\u1ec5n b\u1eb1ng h\u00ecnh ch\u1eef nh\u1eadt v\u1edbi t\u00ean th\u1ef1c th\u1ec3 \u0111\u01b0\u1ee3c vi\u1ebft b\u00ean trong. Thu\u1ed9c t\u00ednh: \u0111\u01b0\u1ee3c bi\u1ec3u di\u1ec5n b\u1eb1ng h\u00ecnh elip k\u1ebft n\u1ed1i v\u1edbi th\u1ef1c th\u1ec3 m\u00e0 n\u00f3 thu\u1ed9c v\u1ec1 b\u1eb1ng m\u1ed9t \u0111\u01b0\u1eddng th\u1eb3ng. M\u1ed1i quan h\u1ec7: \u0111\u01b0\u1ee3c bi\u1ec3u di\u1ec5n b\u1eb1ng h\u00ecnh thoi k\u1ebft n\u1ed1i c\u00e1c th\u1ef1c th\u1ec3. Ba lo\u1ea1i m\u1ed1i quan h\u1ec7 c\u00f3 th\u1ec3 t\u1ed3n t\u1ea1i gi\u1eefa c\u00e1c th\u1ef1c th\u1ec3 l\u00e0: M\u1ed9t-\u0111\u1ed1i-m\u1ed9t (1:1): n\u01a1i m\u1ed9t th\u1ec3 hi\u1ec7n c\u1ee7a m\u1ed9t th\u1ef1c th\u1ec3 \u0111\u01b0\u1ee3c li\u00ean k\u1ebft v\u1edbi m\u1ed9t th\u1ec3 hi\u1ec7n c\u1ee7a th\u1ef1c th\u1ec3 kh\u00e1c. M\u1ed9t-\u0111\u1ed1i-nhi\u1ec1u (1:N): n\u01a1i m\u1ed9t th\u1ec3 hi\u1ec7n c\u1ee7a m\u1ed9t th\u1ef1c th\u1ec3 \u0111\u01b0\u1ee3c li\u00ean k\u1ebft v\u1edbi nhi\u1ec1u th\u1ec3 hi\u1ec7n c\u1ee7a th\u1ef1c th\u1ec3 kh\u00e1c. Nhi\u1ec1u-\u0111\u1ed1i-nhi\u1ec1u (N:M): n\u01a1i nhi\u1ec1u th\u1ec3 hi\u1ec7n c\u1ee7a m\u1ed9t th\u1ef1c th\u1ec3 \u0111\u01b0\u1ee3c li\u00ean k\u1ebft v\u1edbi nhi\u1ec1u th\u1ec3 hi\u1ec7n c\u1ee7a th\u1ef1c th\u1ec3 kh\u00e1c. V\u00ed d\u1ee5 v\u1ec1 m\u00f4 h\u00ecnh h\u00f3a d\u1eef li\u1ec7u s\u1eed d\u1ee5ng ERD H\u00e3y c\u00f9ng xem x\u00e9t m\u1ed9t v\u00ed d\u1ee5 v\u1ec1 m\u1ed9t c\u1eeda h\u00e0ng s\u00e1ch tr\u1ef1c tuy\u1ebfn b\u00e1n s\u00e1ch cho kh\u00e1ch h\u00e0ng. C\u1eeda h\u00e0ng s\u00e1ch c\u00f3 nhi\u1ec1u th\u1ec3 lo\u1ea1i s\u00e1ch v\u00e0 m\u1ed9t l\u01b0\u1ee3ng l\u1edbn kh\u00e1ch h\u00e0ng c\u00f3 th\u1ec3 \u0111\u1eb7t \u0111\u01a1n h\u00e0ng. \u0110\u1ec3 m\u00f4 h\u00ecnh h\u00f3a h\u1ec7 th\u1ed1ng n\u00e0y b\u1eb1ng ERD, ch\u00fang ta c\u00f3 th\u1ec3 b\u1eaft \u0111\u1ea7u b\u1eb1ng vi\u1ec7c x\u00e1c \u0111\u1ecbnh c\u00e1c th\u1ef1c th\u1ec3, thu\u1ed9c t\u00ednh v\u00e0 m\u1ed1i quan h\u1ec7 li\u00ean quan. C\u00e1c th\u1ef1c th\u1ec3: S\u00e1ch: Bi\u1ec3u di\u1ec5n m\u1ed9t cu\u1ed1n s\u00e1ch trong c\u1eeda h\u00e0ng s\u00e1ch. Ch\u1ee9a c\u00e1c thu\u1ed9c t\u00ednh nh\u01b0 ti\u00eau \u0111\u1ec1, t\u00e1c gi\u1ea3, ISBN v\u00e0 gi\u00e1. Th\u1ec3 lo\u1ea1i: Bi\u1ec3u di\u1ec5n m\u1ed9t th\u1ec3 lo\u1ea1i ho\u1eb7c th\u1ec3 lo\u1ea1i s\u00e1ch trong c\u1eeda h\u00e0ng s\u00e1ch. Ch\u1ee9a c\u00e1c thu\u1ed9c t\u00ednh nh\u01b0 t\u00ean v\u00e0 m\u00f4 t\u1ea3. Kh\u00e1ch h\u00e0ng: Bi\u1ec3u di\u1ec5n m\u1ed9t kh\u00e1ch h\u00e0ng \u0111\u00e3 \u0111\u0103ng k\u00fd t\u1ea1i c\u1eeda h\u00e0ng s\u00e1ch. Ch\u1ee9a c\u00e1c thu\u1ed9c t\u00ednh nh\u01b0 t\u00ean, \u0111\u1ecba ch\u1ec9 v\u00e0 email. \u0110\u01a1n h\u00e0ng: Bi\u1ec3u di\u1ec5n m\u1ed9t \u0111\u01a1n h\u00e0ng do kh\u00e1ch h\u00e0ng \u0111\u1eb7t. Ch\u1ee9a c\u00e1c thu\u1ed9c t\u00ednh nh\u01b0 ng\u00e0y \u0111\u1eb7t h\u00e0ng v\u00e0 t\u1ed5ng gi\u00e1. C\u0169ng c\u00f3 tham chi\u1ebfu kh\u00f3a ngo\u1ea1i \u0111\u1ebfn th\u1ef1c th\u1ec3 Kh\u00e1ch h\u00e0ng, cho bi\u1ebft kh\u00e1ch h\u00e0ng n\u00e0o \u0111\u00e3 \u0111\u1eb7t \u0111\u01a1n h\u00e0ng. S\u00e1ch_Th\u1ec3 lo\u1ea1i: Bi\u1ec3u di\u1ec5n m\u1ed1i quan h\u1ec7 nhi\u1ec1u-\u0111\u1ed1i-nhi\u1ec1u gi\u1eefa s\u00e1ch v\u00e0 th\u1ec3 lo\u1ea1i. Ch\u1ee9a c\u00e1c tham chi\u1ebfu kh\u00f3a ngo\u1ea1i \u0111\u1ebfn c\u1ea3 th\u1ef1c th\u1ec3 S\u00e1ch v\u00e0 Th\u1ec3 lo\u1ea1i. \u0110\u01a1n_h\u00e0ng_S\u00e1ch: Bi\u1ec3u di\u1ec5n m\u1ed1i quan h\u1ec7 nhi\u1ec1u-\u0111\u1ed1i-nhi\u1ec1u gi\u1eefa \u0111\u01a1n h\u00e0ng v\u00e0 s\u00e1ch. Ch\u1ee9a c\u00e1c tham chi\u1ebfu kh\u00f3a ngo\u1ea1i \u0111\u1ebfn c\u1ea3 th\u1ef1c th\u1ec3 \u0110\u01a1n_h\u00e0ng v\u00e0 S\u00e1ch. C\u00e1c m\u1ed1i quan h\u1ec7: M\u1ed9t cu\u1ed1n s\u00e1ch c\u00f3 th\u1ec3 thu\u1ed9c v\u1ec1 nhi\u1ec1u th\u1ec3 lo\u1ea1i (Nhi\u1ec1u-\u0111\u1ed1i-nhi\u1ec1u). M\u1ed9t th\u1ec3 lo\u1ea1i c\u00f3 th\u1ec3 c\u00f3 nhi\u1ec1u s\u00e1ch (M\u1ed9t-\u0111\u1ed1i-nhi\u1ec1u). M\u1ed9t kh\u00e1ch h\u00e0ng c\u00f3 th\u1ec3 \u0111\u1eb7t nhi\u1ec1u \u0111\u01a1n h\u00e0ng (M\u1ed9t-\u0111\u1ed1i-nhi\u1ec1u). M\u1ed9t \u0111\u01a1n h\u00e0ng c\u00f3 th\u1ec3 ch\u1ee9a nhi\u1ec1u s\u00e1ch (Nhi\u1ec1u-\u0111\u1ed1i-nhi\u1ec1u). V\u1edbi c\u00e1c th\u1ef1c th\u1ec3, thu\u1ed9c t\u00ednh v\u00e0 m\u1ed1i quan h\u1ec7 n\u00e0y trong t\u00e2m tr\u00ed, ch\u00fang ta c\u00f3 th\u1ec3 t\u1ea1o m\u1ed9t ERD cho h\u1ec7 th\u1ed1ng c\u1eeda h\u00e0ng s\u00e1ch tr\u1ef1c tuy\u1ebfn. ERD s\u1ebd tr\u00f4ng gi\u1ed1ng nh\u01b0 sau: Trong s\u01a1 \u0111\u1ed3 ERD n\u00e0y, ch\u00fang ta c\u00f3 th\u1ec3 th\u1ea5y r\u1eb1ng th\u1ef1c th\u1ec3 S\u00e1ch c\u00f3 m\u1ed1i quan h\u1ec7 nhi\u1ec1u-\u0111\u1ed1i-nhi\u1ec1u v\u1edbi th\u1ef1c th\u1ec3 Th\u1ec3 lo\u1ea1i, \u0111i\u1ec1u \u0111\u00f3 c\u00f3 ngh\u0129a l\u00e0 m\u1ed9t cu\u1ed1n s\u00e1ch c\u00f3 th\u1ec3 thu\u1ed9c v\u1ec1 nhi\u1ec1u th\u1ec3 lo\u1ea1i, v\u00e0 m\u1ed9t th\u1ec3 lo\u1ea1i c\u00f3 th\u1ec3 c\u00f3 nhi\u1ec1u s\u00e1ch. Th\u1ef1c th\u1ec3 Kh\u00e1ch h\u00e0ng c\u00f3 m\u1ed1i quan h\u1ec7 m\u1ed9t-\u0111\u1ed1i-nhi\u1ec1u v\u1edbi th\u1ef1c th\u1ec3 \u0110\u01a1n_h\u00e0ng, \u0111i\u1ec1u \u0111\u00f3 c\u00f3 ngh\u0129a l\u00e0 m\u1ed9t kh\u00e1ch h\u00e0ng c\u00f3 th\u1ec3 \u0111\u1eb7t nhi\u1ec1u \u0111\u01a1n h\u00e0ng, nh\u01b0ng m\u1ed7i \u0111\u01a1n h\u00e0ng ch\u1ec9 thu\u1ed9c v\u1ec1 m\u1ed9t kh\u00e1ch h\u00e0ng. Cu\u1ed1i c\u00f9ng, th\u1ef1c th\u1ec3 \u0110\u01a1n_h\u00e0ng c\u00f3 m\u1ed1i quan h\u1ec7 nhi\u1ec1u-\u0111\u1ed1i-nhi\u1ec1u v\u1edbi th\u1ef1c th\u1ec3 S\u00e1ch, \u0111i\u1ec1u \u0111\u00f3 c\u00f3 ngh\u0129a l\u00e0 m\u1ed9t \u0111\u01a1n h\u00e0ng c\u00f3 th\u1ec3 ch\u1ee9a nhi\u1ec1u s\u00e1ch, v\u00e0 m\u1ed9t cu\u1ed1n s\u00e1ch c\u00f3 th\u1ec3 xu\u1ea5t hi\u1ec7n trong nhi\u1ec1u \u0111\u01a1n h\u00e0ng. T\u1ea1o m\u00e3 SQL l\u01b0\u1ee3c \u0111\u1ed3 c\u01a1 s\u1edf d\u1eef li\u1ec7u v\u1edbi Visual Paradigm B\u1ea3ng s\u00e1ch { id int [kh\u00f3a ch\u00ednh, t\u0103ng d\u1ea7n] title varchar author varchar isbn varchar price float } B\u1ea3ng category { id int [kh\u00f3a ch\u00ednh, t\u0103ng d\u1ea7n] name varchar description varchar } B\u1ea3ng customer { id int [kh\u00f3a ch\u00ednh, t\u0103ng d\u1ea7n] name varchar address varchar email varchar } B\u1ea3ng order { id int [kh\u00f3a ch\u00ednh, t\u0103ng d\u1ea7n] order_date datetime total_price float customer_id int [tham chi\u1ebfu: > customer.id] } B\u1ea3ng book_category { book_id int [tham chi\u1ebfu: > book.id] category_id int [tham chi\u1ebfu: > category.id] } B\u1ea3ng order_book { order_id int [tham chi\u1ebfu: > order.id] book_id int [tham chi\u1ebfu: > book.id] } K\u1ebft lu\u1eadn M\u00f4 h\u00ecnh h\u00f3a d\u1eef li\u1ec7u b\u1eb1ng s\u01a1 \u0111\u1ed3 ERD l\u00e0 m\u1ed9t qu\u00e1 tr\u00ecnh quan tr\u1ecdng gi\u00fap ch\u00fang ta h\u00ecnh dung v\u00e0 hi\u1ec3u r\u00f5 m\u1ed1i quan h\u1ec7 gi\u1eefa c\u00e1c th\u1ef1c th\u1ec3 trong c\u01a1 s\u1edf d\u1eef li\u1ec7u. B\u1eb1ng c\u00e1ch x\u00e1c \u0111\u1ecbnh c\u00e1c th\u1ef1c th\u1ec3, thu\u1ed9c t\u00ednh v\u00e0 m\u1ed1i quan h\u1ec7, ch\u00fang ta c\u00f3 th\u1ec3 t\u1ea1o ra m\u1ed9t s\u01a1 \u0111\u1ed3 ERD th\u1ec3 hi\u1ec7n d\u1eef li\u1ec7u v\u00e0 c\u1ea5u tr\u00fac c\u1ee7a n\u00f3 m\u1ed9t c\u00e1ch r\u00f5 r\u00e0ng v\u00e0 s\u00fac t\u00edch. \u0110i\u1ec1u n\u00e0y gi\u00fap ch\u00fang ta thi\u1ebft k\u1ebf v\u00e0 duy tr\u00ec c\u00e1c c\u01a1 s\u1edf d\u1eefX\u00e2y d\u1ef1ng m\u1ed9t c\u1eeda h\u00e0ng s\u00e1ch tr\u1ef1c tuy\u1ebfn: M\u00f4 h\u00ecnh h\u00f3a d\u1eef li\u1ec7u v\u1edbi ERD v\u00e0 DBML","og_url":"https:\/\/guides.visual-paradigm.com\/vn\/building-an-online-bookstore-data-modeling-with-erd-and-dbml\/","og_site_name":"Visual Paradigm Guides Vietnamese","article_published_time":"2026-02-05T15:04:26+00:00","og_image":[{"width":663,"height":418,"url":"https:\/\/guides.visual-paradigm.com\/vn\/wp-content\/uploads\/sites\/10\/2026\/02\/ERD-for-bookstore.png","type":"image\/png"}],"twitter_card":"summary_large_image","twitter_misc":{"\u0110\u01b0\u1ee3c vi\u1ebft b\u1edfi":"vpadmin","\u01af\u1edbc t\u00ednh th\u1eddi gian \u0111\u1ecdc":"4 ph\u00fat"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/guides.visual-paradigm.com\/vn\/building-an-online-bookstore-data-modeling-with-erd-and-dbml\/#article","isPartOf":{"@id":"https:\/\/guides.visual-paradigm.com\/vn\/building-an-online-bookstore-data-modeling-with-erd-and-dbml\/"},"headline":"X\u00e2y d\u1ef1ng m\u1ed9t c\u1eeda h\u00e0ng s\u00e1ch tr\u1ef1c tuy\u1ebfn: M\u00f4 h\u00ecnh h\u00f3a d\u1eef li\u1ec7u v\u1edbi ERD v\u00e0 DBML","datePublished":"2026-02-05T15:04:26+00:00","mainEntityOfPage":{"@id":"https:\/\/guides.visual-paradigm.com\/vn\/building-an-online-bookstore-data-modeling-with-erd-and-dbml\/"},"wordCount":1616,"commentCount":0,"image":{"@id":"https:\/\/guides.visual-paradigm.com\/vn\/building-an-online-bookstore-data-modeling-with-erd-and-dbml\/#primaryimage"},"thumbnailUrl":"https:\/\/guides.visual-paradigm.com\/vn\/wp-content\/uploads\/sites\/10\/2026\/02\/ERD-for-bookstore.png","articleSection":["Data Modeling \/ Database"],"inLanguage":"vi","potentialAction":[{"@type":"CommentAction","name":"Comment","target":["https:\/\/guides.visual-paradigm.com\/vn\/building-an-online-bookstore-data-modeling-with-erd-and-dbml\/#respond"]}]},{"@type":"WebPage","@id":"https:\/\/guides.visual-paradigm.com\/vn\/building-an-online-bookstore-data-modeling-with-erd-and-dbml\/","url":"https:\/\/guides.visual-paradigm.com\/vn\/building-an-online-bookstore-data-modeling-with-erd-and-dbml\/","name":"X\u00e2y d\u1ef1ng m\u1ed9t c\u1eeda h\u00e0ng s\u00e1ch tr\u1ef1c tuy\u1ebfn: M\u00f4 h\u00ecnh h\u00f3a d\u1eef li\u1ec7u v\u1edbi ERD v\u00e0 DBML - 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