{"id":1574,"date":"2026-03-23T11:10:38","date_gmt":"2026-03-23T11:10:38","guid":{"rendered":"https:\/\/www.go-diagram.com\/vi\/cardinality-participation-constraints-erd-explained\/"},"modified":"2026-03-23T11:10:38","modified_gmt":"2026-03-23T11:10:38","slug":"cardinality-participation-constraints-erd-explained","status":"publish","type":"post","link":"https:\/\/www.go-diagram.com\/vi\/cardinality-participation-constraints-erd-explained\/","title":{"rendered":"H\u01b0\u1edbng d\u1eabn ERD: C\u00e1c r\u00e0ng bu\u1ed9c Cardinality v\u00e0 Tham gia: C\u00e1c v\u00ed d\u1ee5 th\u1ef1c t\u1ebf \u0111\u01b0\u1ee3c gi\u1ea3i th\u00edch"},"content":{"rendered":"<p>M\u00f4 h\u00ecnh h\u00f3a d\u1eef li\u1ec7u l\u00e0 n\u1ec1n t\u1ea3ng c\u1ee7a c\u00e1c h\u1ec7 th\u1ed1ng ph\u1ea7n m\u1ec1m \u0111\u00e1ng tin c\u1eady. Kh\u00f4ng c\u00f3 c\u00e1c quy t\u1eafc r\u00f5 r\u00e0ng \u0111i\u1ec1u ch\u1ec9nh c\u00e1ch d\u1eef li\u1ec7u li\u00ean k\u1ebft v\u1edbi ch\u00ednh n\u00f3, c\u00e1c \u1ee9ng d\u1ee5ng s\u1ebd tr\u1edf n\u00ean mong manh, kh\u00f4ng nh\u1ea5t qu\u00e1n v\u00e0 kh\u00f3 m\u1edf r\u1ed9ng. Hai kh\u00e1i ni\u1ec7m c\u01a1 b\u1ea3n \u0111i\u1ec1u khi\u1ec3n c\u00e1c m\u1ed1i quan h\u1ec7 n\u00e0y trong s\u01a1 \u0111\u1ed3 Th\u1ef1c th\u1ec3 &#8211; Li\u00ean k\u1ebft (ERD): r\u00e0ng bu\u1ed9c cardinality v\u00e0 r\u00e0ng bu\u1ed9c tham gia. Hi\u1ec3u r\u00f5 nh\u1eefng kh\u00e1i ni\u1ec7m n\u00e0y kh\u00f4ng ch\u1ec9 mang t\u00ednh h\u1ecdc thu\u1eadt; n\u00f3 quy\u1ebft \u0111\u1ecbnh vi\u1ec7c c\u01a1 s\u1edf d\u1eef li\u1ec7u c\u1ee7a b\u1ea1n c\u00f3 th\u1ef1c thi \u0111\u00fang logic kinh doanh hay kh\u00f4ng.<\/p>\n<p>H\u01b0\u1edbng d\u1eabn n\u00e0y ph\u00e2n t\u00edch c\u00e1c r\u00e0ng bu\u1ed9c n\u00e0y b\u1eb1ng c\u00e1c t\u00ecnh hu\u1ed1ng th\u1ef1c t\u1ebf, logic tr\u1ef1c quan v\u00e0 c\u00e1c y\u1ebfu t\u1ed1 li\u00ean quan \u0111\u1ebfn tri\u1ec3n khai. Ch\u00fang ta s\u1ebd kh\u00e1m ph\u00e1 c\u00e1ch x\u00e1c \u0111\u1ecbnh c\u00e1c m\u1ed1i quan h\u1ec7 gi\u1eefa c\u00e1c th\u1ef1c th\u1ec3 m\u00e0 kh\u00f4ng ph\u1ee5 thu\u1ed9c v\u00e0o c\u00f4ng c\u1ee5 c\u1ee5 th\u1ec3, \u0111\u1ea3m b\u1ea3o c\u00e1c m\u00f4 h\u00ecnh logic c\u1ee7a b\u1ea1n \u0111\u01b0\u1ee3c chuy\u1ec3n \u0111\u1ed5i m\u1ed9t c\u00e1ch r\u00f5 r\u00e0ng th\u00e0nh c\u00e1c c\u1ea5u tr\u00fac v\u1eadt l\u00fd.<\/p>\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img alt=\"Hand-drawn whiteboard infographic explaining Entity-Relationship Diagram constraints: cardinality types (one-to-one User-Profile, one-to-many Department-Employee, many-to-many Student-Course via junction table) and participation constraints (total\/mandatory with NOT NULL for OrderLine-Order, partial\/optional with NULL allowed for Product-Review), featuring crow's foot notation symbols, real-world database examples, foreign key implementation tips, and common design pitfalls for software developers and data architects\" decoding=\"async\" src=\"https:\/\/www.go-diagram.com\/wp-content\/uploads\/2026\/03\/erd-cardinality-participation-constraints-whiteboard-infographic.jpg\"\/><\/figure>\n<\/div>\n<h2>\ud83d\udd11 Hi\u1ec3u v\u1ec1 Cardinality<\/h2>\n<p>Cardinality x\u00e1c \u0111\u1ecbnh m\u1ed1i quan h\u1ec7 s\u1ed1 l\u01b0\u1ee3ng gi\u1eefa c\u00e1c th\u1ef1c th\u1ec3. N\u00f3 tr\u1ea3 l\u1eddi c\u00e2u h\u1ecfi:<strong>\u201cM\u1ed9t th\u1ef1c th\u1ec3 B c\u00f3 th\u1ec3 li\u00ean k\u1ebft v\u1edbi bao nhi\u00eau th\u1ef1c th\u1ec3 A?\u201d<\/strong>Trong thi\u1ebft k\u1ebf c\u01a1 s\u1edf d\u1eef li\u1ec7u, \u0111i\u1ec1u n\u00e0y quy\u1ebft \u0111\u1ecbnh v\u1ecb tr\u00ed kh\u00f3a ngo\u1ea1i v\u00e0 c\u00e1c chi\u1ebfn l\u01b0\u1ee3c ch\u1ec9 m\u1ee5c.<\/p>\n<p>C\u00f3 ba lo\u1ea1i m\u1ed1i quan h\u1ec7 cardinality ch\u00ednh:<\/p>\n<ul>\n<li><strong>M\u1ed9t-\u0111\u1ed1i-m\u1ed9t (1:1)<\/strong><\/li>\n<li><strong>M\u1ed9t-\u0111\u1ed1i-nhi\u1ec1u (1:N)<\/strong><\/li>\n<li><strong>Nhi\u1ec1u-\u0111\u1ed1i-nhi\u1ec1u (M:N)<\/strong><\/li>\n<\/ul>\n<h3>1\ufe0f\u20e3 M\u1ed9t-\u0111\u1ed1i-m\u1ed9t (1:1)<\/h3>\n<p>Trong m\u1ed1i quan h\u1ec7 1:1, m\u1ed9t b\u1ea3n ghi duy nh\u1ea5t trong th\u1ef1c th\u1ec3 A li\u00ean k\u1ebft v\u1edbi ch\u1ec9 m\u1ed9t b\u1ea3n ghi trong th\u1ef1c th\u1ec3 B, v\u00e0 ng\u01b0\u1ee3c l\u1ea1i. \u0110i\u1ec1u n\u00e0y th\u01b0\u1eddng x\u1ea3y ra khi chia nh\u1ecf m\u1ed9t th\u1ef1c th\u1ec3 l\u1edbn \u0111\u1ec3 c\u1ea3i thi\u1ec7n hi\u1ec7u su\u1ea5t ho\u1eb7c b\u1ea3o m\u1eadt.<\/p>\n<p><strong>T\u00ecnh hu\u1ed1ng v\u00ed d\u1ee5: Ng\u01b0\u1eddi d\u00f9ng v\u00e0 H\u1ed3 s\u01a1<\/strong><\/p>\n<ul>\n<li>M\u1ed9t <strong>Ng\u01b0\u1eddi d\u00f9ng<\/strong>t\u00e0i kho\u1ea3n th\u01b0\u1eddng l\u01b0u tr\u1eef th\u00f4ng tin \u0111\u0103ng nh\u1eadp.<\/li>\n<li>M\u1ed9t <strong>H\u1ed3 s\u01a1<\/strong>ch\u1ee9a c\u00e1c th\u00f4ng tin c\u00e1 nh\u00e2n nh\u01b0 ti\u1ec3u s\u1eed, \u1ea3nh \u0111\u1ea1i di\u1ec7n v\u00e0 t\u00f9y ch\u1ecdn.<\/li>\n<li>M\u1ed9t Ng\u01b0\u1eddi d\u00f9ng s\u1edf h\u1eefu \u0111\u00fang m\u1ed9t H\u1ed3 s\u01a1.<\/li>\n<li>M\u1ed9t H\u1ed3 s\u01a1 thu\u1ed9c v\u1ec1 \u0111\u00fang m\u1ed9t Ng\u01b0\u1eddi d\u00f9ng.<\/li>\n<\/ul>\n<p><strong>Logic tri\u1ec3n khai:<\/strong><\/p>\n<ul>\n<li>\u0110\u1eb7t kh\u00f3a ngo\u1ea1i trong m\u1ed9t b\u1ea3ng tr\u1ecf \u0111\u1ebfn kh\u00f3a ch\u00ednh c\u1ee7a b\u1ea3ng kia.<\/li>\n<li>\u00c1p d\u1ee5ng m\u1ed9t <code>UNIQUE<\/code>r\u00e0ng bu\u1ed9c v\u00e0o c\u1ed9t kh\u00f3a ngo\u1ea1i.<\/li>\n<li>\u0110i\u1ec1u n\u00e0y \u0111\u1ea3m b\u1ea3o kh\u00f4ng c\u00f3 hai b\u1ea3n ghi Ng\u01b0\u1eddi d\u00f9ng n\u00e0o tr\u1ecf \u0111\u1ebfn c\u00f9ng m\u1ed9t H\u1ed3 s\u01a1.<\/li>\n<\/ul>\n<h3>\ud83d\udd17 M\u1ed9t-\u0111\u1ed1i-nhi\u1ec1u (1:N)<\/h3>\n<p>\u0110\u00e2y l\u00e0 m\u1ed1i quan h\u1ec7 ph\u1ed5 bi\u1ebfn nh\u1ea5t trong c\u01a1 s\u1edf d\u1eef li\u1ec7u quan h\u1ec7. M\u1ed9t b\u1ea3n ghi trong th\u1ef1c th\u1ec3 A c\u00f3 th\u1ec3 li\u00ean k\u1ebft v\u1edbi nhi\u1ec1u b\u1ea3n ghi trong th\u1ef1c th\u1ec3 B, nh\u01b0ng m\u1ed7i b\u1ea3n ghi trong th\u1ef1c th\u1ec3 B ch\u1ec9 li\u00ean k\u1ebft v\u1edbi m\u1ed9t b\u1ea3n ghi duy nh\u1ea5t trong th\u1ef1c th\u1ec3 A.<\/p>\n<p><strong>V\u00ed d\u1ee5 t\u00ecnh hu\u1ed1ng: Ph\u00f2ng ban v\u00e0 Nh\u00e2n vi\u00ean<\/strong><\/p>\n<ul>\n<li><strong>Ph\u00f2ng ban<\/strong> (v\u00ed d\u1ee5: K\u1ef9 thu\u1eadt, B\u00e1n h\u00e0ng).<\/li>\n<li><strong>Nh\u00e2n vi\u00ean<\/strong> (Th\u00e0nh vi\u00ean nh\u00e2n s\u1ef1 c\u00e1 nh\u00e2n).<\/li>\n<li>M\u1ed9t Ph\u00f2ng ban tuy\u1ec3n d\u1ee5ng Nhi\u1ec1u Nh\u00e2n vi\u00ean.<\/li>\n<li>M\u1ed9t Nh\u00e2n vi\u00ean l\u00e0m vi\u1ec7c cho Ch\u1ec9 m\u1ed9t Ph\u00f2ng ban.<\/li>\n<\/ul>\n<p><strong>Logic tri\u1ec3n khai:<\/strong><\/p>\n<ul>\n<li>\u0110\u1eb7t Kh\u00f3a ngo\u1ea1i \u1edf ph\u00eda \u201cNhi\u1ec1u\u201d (b\u1ea3ng Nh\u00e2n vi\u00ean).<\/li>\n<li>B\u1ea3ng Ph\u00f2ng ban v\u1eabn gi\u1eef vai tr\u00f2 cha.<\/li>\n<li>X\u00f3a m\u1ed9t Ph\u00f2ng ban c\u00f3 th\u1ec3 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn nh\u00e2n vi\u00ean (n\u1ebfu \u0111\u01b0\u1ee3c ph\u00e9p) ho\u1eb7c y\u00eau c\u1ea7u x\u1eed l\u00fd c\u00e1c b\u1ea3n ghi b\u1ecb b\u1ecf r\u01a1i.<\/li>\n<\/ul>\n<h3>\ud83d\udd04 Nhi\u1ec1u-\u0111\u1ebfn-nhi\u1ec1u (M:N)<\/h3>\n<p>Nhi\u1ec1u b\u1ea3n ghi trong Th\u1ef1c th\u1ec3 A li\u00ean k\u1ebft v\u1edbi nhi\u1ec1u b\u1ea3n ghi trong Th\u1ef1c th\u1ec3 B. B\u1ea1n kh\u00f4ng th\u1ec3 k\u1ebft n\u1ed1i tr\u1ef1c ti\u1ebfp ch\u00fang trong c\u01a1 s\u1edf d\u1eef li\u1ec7u v\u1eadt l\u00fd m\u00e0 kh\u00f4ng c\u00f3 m\u1ed9t th\u1ef1c th\u1ec3 trung gian.<\/p>\n<p><strong>V\u00ed d\u1ee5 t\u00ecnh hu\u1ed1ng: Sinh vi\u00ean v\u00e0 Kh\u00f3a h\u1ecdc<\/strong><\/p>\n<ul>\n<li><strong>Sinh vi\u00ean<\/strong> tham gia nhi\u1ec1u Kh\u00f3a h\u1ecdc.<\/li>\n<li><strong>Kh\u00f3a h\u1ecdc<\/strong> c\u00f3 nhi\u1ec1u Sinh vi\u00ean.<\/li>\n<\/ul>\n<p><strong>Logic tri\u1ec3n khai:<\/strong><\/p>\n<ul>\n<li>T\u1ea1o m\u1ed9t b\u1ea3ng li\u00ean k\u1ebft (c\u00f2n \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 b\u1ea3ng n\u1ed1i ho\u1eb7c b\u1ea3ng c\u1ea7u).<\/li>\n<li>Bao g\u1ed3m Kh\u00f3a ngo\u1ea1i t\u1eeb c\u1ea3 hai th\u1ef1c th\u1ec3 ban \u0111\u1ea7u.<\/li>\n<li>Th\u00eam kh\u00f3a ch\u00ednh h\u1ee3p th\u00e0nh ho\u1eb7c r\u00e0ng bu\u1ed9c duy nh\u1ea5t \u0111\u1ec3 ng\u0103n ch\u1eb7n vi\u1ec7c \u0111\u0103ng k\u00fd tr\u00f9ng l\u1eb7p.<\/li>\n<\/ul>\n<h2>\ud83d\udd12 Hi\u1ec3u v\u1ec1 r\u00e0ng bu\u1ed9c tham gia<\/h2>\n<p>Cardinality cho ch\u00fang ta bi\u1ebft s\u1ed1 l\u01b0\u1ee3ng, nh\u01b0ng tham gia cho ch\u00fang ta bi\u1ebft <strong>ngh\u0129a v\u1ee5<\/strong>. N\u00f3 x\u00e1c \u0111\u1ecbnh m\u1ed1i quan h\u1ec7 l\u00e0 b\u1eaft bu\u1ed9c hay t\u00f9y ch\u1ecdn. S\u1ef1 ph\u00e2n bi\u1ec7t n\u00e0y r\u1ea5t quan tr\u1ecdng \u0111\u1ed1i v\u1edbi kh\u1ea3 n\u0103ng null v\u00e0 t\u00ednh to\u00e0n v\u1eb9n d\u1eef li\u1ec7u.<\/p>\n<h3>\ud83d\udccc Tham gia to\u00e0n b\u1ed9 (b\u1eaft bu\u1ed9c)<\/h3>\n<p>M\u1ed7i tr\u01b0\u1eddng h\u1ee3p c\u1ee7a m\u1ed9t th\u1ef1c th\u1ec3 <em>ph\u1ea3i<\/em>tham gia v\u00e0o m\u1ed1i quan h\u1ec7. V\u1ec1 m\u1eb7t c\u01a1 s\u1edf d\u1eef li\u1ec7u, c\u1ed9t Kh\u00f3a ngo\u1ea1i kh\u00f4ng \u0111\u01b0\u1ee3c ph\u00e9p l\u00e0 null.<\/p>\n<ul>\n<li><strong>Logic:<\/strong> M\u1ed9t th\u1ec3 hi\u1ec7n kh\u00f4ng th\u1ec3 t\u1ed3n t\u1ea1i m\u00e0 kh\u00f4ng c\u00f3 th\u1ec3 hi\u1ec7n li\u00ean quan.<\/li>\n<li><strong>R\u00e0ng bu\u1ed9c:<\/strong> <code>KH\u00d4NG \u0110\u01af\u1ee2C R\u1ed6NG<\/code>tr\u00ean c\u1ed9t kh\u00f3a ngo\u1ea1i.<\/li>\n<\/ul>\n<p><strong>V\u00ed d\u1ee5: \u0110\u01a1n h\u00e0ng v\u00e0 Chi ti\u1ebft \u0111\u01a1n h\u00e0ng<\/strong><\/p>\n<ul>\n<li>M\u1ed7i Chi ti\u1ebft \u0111\u01a1n h\u00e0ng<strong>ph\u1ea3i<\/strong>thu\u1ed9c v\u1ec1 m\u1ed9t \u0110\u01a1n h\u00e0ng.<\/li>\n<li>M\u1ed9t Chi ti\u1ebft \u0111\u01a1n h\u00e0ng kh\u00f4ng th\u1ec3 t\u1ed3n t\u1ea1i m\u00e0 kh\u00f4ng c\u00f3 b\u1ed1i c\u1ea3nh \u0110\u01a1n h\u00e0ng.<\/li>\n<li>Do \u0111\u00f3, c\u1ed9t<code>order_id<\/code>trong b\u1ea3ng Chi ti\u1ebft \u0111\u01a1n h\u00e0ng l\u00e0 b\u1eaft bu\u1ed9c.<\/li>\n<\/ul>\n<h3>\ud83d\udccd Tham gia m\u1ed9t ph\u1ea7n (t\u00f9y ch\u1ecdn)<\/h3>\n<p>M\u1ed9t th\u1ec3 hi\u1ec7n c\u1ee7a m\u1ed9t th\u1ef1c th\u1ec3<em>c\u00f3 th\u1ec3<\/em>tham gia v\u00e0o m\u1ed1i quan h\u1ec7, nh\u01b0ng kh\u00f4ng b\u1eaft bu\u1ed9c. C\u1ed9t kh\u00f3a ngo\u1ea1i cho ph\u00e9p gi\u00e1 tr\u1ecb r\u1ed7ng.<\/p>\n<ul>\n<li><strong>Logic:<\/strong>M\u1ed9t th\u1ec3 hi\u1ec7n c\u00f3 th\u1ec3 t\u1ed3n t\u1ea1i \u0111\u1ed9c l\u1eadp v\u1edbi m\u1ed1i quan h\u1ec7.<\/li>\n<li><strong>R\u00e0ng bu\u1ed9c:<\/strong>Cho ph\u00e9p<code>R\u1ed6NG<\/code>tr\u00ean c\u1ed9t kh\u00f3a ngo\u1ea1i.<\/li>\n<\/ul>\n<p><strong>V\u00ed d\u1ee5: S\u1ea3n ph\u1ea9m v\u00e0 \u0110\u00e1nh gi\u00e1<\/strong><\/p>\n<ul>\n<li>M\u1ed9t S\u1ea3n ph\u1ea9m c\u00f3 th\u1ec3 t\u1ed3n t\u1ea1i m\u00e0 kh\u00f4ng c\u1ea7n b\u1ea5t k\u1ef3 \u0110\u00e1nh gi\u00e1 n\u00e0o.<\/li>\n<li>M\u1ed9t \u0110\u00e1nh gi\u00e1 ph\u1ea3i thu\u1ed9c v\u1ec1 m\u1ed9t S\u1ea3n ph\u1ea9m (th\u01b0\u1eddng th\u00ec v\u1eady).<\/li>\n<li>Do \u0111\u00f3, kh\u00f3a ngo\u1ea1i tr\u00ean b\u1ea3ng \u0110\u00e1nh gi\u00e1 l\u00e0 b\u1eaft bu\u1ed9c, nh\u01b0ng li\u00ean k\u1ebft ng\u01b0\u1ee3c l\u1ea1i (S\u1ea3n ph\u1ea9m c\u00f3 m\u1ed9t \u0111\u00e1nh gi\u00e1) l\u00e0 t\u00f9y ch\u1ecdn.<\/li>\n<\/ul>\n<h2>\ud83c\udfe2 C\u00e1c t\u00ecnh hu\u1ed1ng th\u1ef1c t\u1ebf v\u00e0 \u1ee9ng d\u1ee5ng<\/h2>\n<p>H\u00e3y c\u00f9ng xem x\u00e9t c\u00e1c m\u00f4i tr\u01b0\u1eddng ph\u1ee9c t\u1ea1p n\u01a1i c\u00e1c r\u00e0ng bu\u1ed9c n\u00e0y giao nhau. Hi\u1ec3u r\u00f5 c\u00e1c quy t\u1eafc kinh doanh \u1edf \u0111\u00e2y s\u1ebd ng\u0103n ng\u1eeba l\u1ed7i d\u1eef li\u1ec7u sau n\u00e0y.<\/p>\n<h3>\ud83c\udfe5 H\u1ec7 th\u1ed1ng y t\u1ebf: B\u00e1c s\u0129 v\u00e0 B\u1ec7nh nh\u00e2n<\/h3>\n<p>X\u00e9t m\u1ed9t b\u1ed1i c\u1ea3nh qu\u1ea3n l\u00fd b\u1ec7nh vi\u1ec7n.<\/p>\n<ul>\n<li><strong>B\u00e1c s\u0129:<\/strong>Chuy\u00ean gia y t\u1ebf.<\/li>\n<li><strong>B\u1ec7nh nh\u00e2n:<\/strong>C\u00e1 nh\u00e2n \u0111ang \u0111\u01b0\u1ee3c ch\u0103m s\u00f3c.<\/li>\n<\/ul>\n<p><strong>Ph\u00e2n t\u00edch m\u1ed1i quan h\u1ec7:<\/strong><\/p>\n<ul>\n<li>M\u1ed9t b\u00e1c s\u0129 \u0111i\u1ec1u tr\u1ecb nhi\u1ec1u b\u1ec7nh nh\u00e2n theo th\u1eddi gian. (1:N)<\/li>\n<li>M\u1ed9t b\u1ec7nh nh\u00e2n th\u0103m nhi\u1ec1u b\u00e1c s\u0129 cho c\u00e1c t\u00ecnh tr\u1ea1ng kh\u00e1c nhau. (N:1)<\/li>\n<li><strong>S\u1eeda \u0111\u1ed5i:<\/strong>\u0110\u1ec3 theo d\u00f5i c\u00e1c l\u1ea7n th\u0103m kh\u00e1m c\u1ee5 th\u1ec3, m\u1ed1i quan h\u1ec7 n\u00e0y tr\u1edf th\u00e0nh Nhi\u1ec1u-\u0111\u1ebfn-Nhi\u1ec1u th\u00f4ng qua m\u1ed9t b\u1ea3ng<code>L\u1ecbch h\u1eb9n<\/code>b\u1ea3ng.<\/li>\n<\/ul>\n<p><strong>Quy t\u1eafc tham gia:<\/strong><\/p>\n<ul>\n<li><strong>L\u1ecbch h\u1eb9n:<\/strong>Ph\u1ea3i c\u00f3 m\u1ed9t b\u00e1c s\u0129 (tham gia to\u00e0n b\u1ed9).<\/li>\n<li><strong>L\u1ecbch h\u1eb9n:<\/strong>Ph\u1ea3i c\u00f3 m\u1ed9t b\u1ec7nh nh\u00e2n (tham gia to\u00e0n b\u1ed9).<\/li>\n<li><strong>B\u00e1c s\u0129:<\/strong>C\u00f3 th\u1ec3 t\u1ed3n t\u1ea1i m\u00e0 kh\u00f4ng c\u1ea7n l\u1ecbch h\u1eb9n (tham gia t\u1eebng ph\u1ea7n \u2013 v\u00ed d\u1ee5: \u0111ang ngh\u1ec9 ph\u00e9p).<\/li>\n<\/ul>\n<h3>\ud83d\uded2 N\u1ec1n t\u1ea3ng Th\u01b0\u01a1ng m\u1ea1i \u0111i\u1ec7n t\u1eed: S\u1ea3n ph\u1ea9m v\u00e0 Kho h\u00e0ng<\/h3>\n<p>B\u00e1n h\u00e0ng tr\u1ef1c tuy\u1ebfn \u0111\u00f2i h\u1ecfi vi\u1ec7c theo d\u00f5i t\u1ed3n kho ch\u00ednh x\u00e1c.<\/p>\n<ul>\n<li><strong>S\u1ea3n ph\u1ea9m:<\/strong>M\u1eb7t h\u00e0ng \u0111\u01b0\u1ee3c b\u00e1n (v\u00ed d\u1ee5: \u201cGi\u00e0y th\u1ec3 thao m\u00e0u \u0111\u1ecf\u201d).<\/li>\n<li><strong>Kho h\u00e0ng:<\/strong>\u0110\u1ecba \u0111i\u1ec3m v\u1eadt l\u00fd.<\/li>\n<li><strong>T\u1ed3n kho:<\/strong>S\u1ed1 l\u01b0\u1ee3ng c\u00f3 s\u1eb5n.<\/li>\n<\/ul>\n<p><strong>S\u1ed1 l\u01b0\u1ee3ng:<\/strong><\/p>\n<ul>\n<li>M\u1ed9t s\u1ea3n ph\u1ea9m c\u00f3 th\u1ec3 t\u1ed3n t\u1ea1i trong nhi\u1ec1u kho h\u00e0ng. (1:N)<\/li>\n<li>M\u1ed9t kho h\u00e0ng ch\u1ee9a nhi\u1ec1u s\u1ea3n ph\u1ea9m. (N:1)<\/li>\n<\/ul>\n<p><strong>Quy t\u1eafc tham gia:<\/strong><\/p>\n<ul>\n<li><strong>S\u1ed5 ghi nh\u1eadn t\u1ed3n kho:<\/strong> Ph\u1ea3i li\u00ean k\u1ebft v\u1edbi m\u1ed9t S\u1ea3n ph\u1ea9m (To\u00e0n b\u1ed9).<\/li>\n<li><strong>S\u1ed5 ghi nh\u1eadn t\u1ed3n kho:<\/strong> Ph\u1ea3i li\u00ean k\u1ebft v\u1edbi m\u1ed9t Kho (To\u00e0n b\u1ed9).<\/li>\n<li><strong>S\u1ea3n ph\u1ea9m:<\/strong> Kh\u00f4ng c\u1ea7n s\u1ed5 ghi nh\u1eadn t\u1ed3n kho ngay l\u1eadp t\u1ee9c (B\u00e1n ph\u1ea7n \u2013 v\u00ed d\u1ee5: h\u00e0ng \u0111\u1eb7t tr\u01b0\u1edbc).<\/li>\n<\/ul>\n<h3>\ud83d\udcda H\u1ec7 th\u1ed1ng Th\u01b0 vi\u1ec7n: S\u00e1ch v\u00e0 T\u00e1c gi\u1ea3<\/h3>\n<p>M\u1ed9t v\u00ed d\u1ee5 kinh \u0111i\u1ec3n th\u01b0\u1eddng b\u1ecb hi\u1ec3u nh\u1ea7m.<\/p>\n<ul>\n<li><strong>S\u00e1ch:<\/strong> M\u1ed9t b\u1ea3n sao v\u1eadt l\u00fd ho\u1eb7c ISBN.<\/li>\n<li><strong>T\u00e1c gi\u1ea3:<\/strong> Ng\u01b0\u1eddi vi\u1ebft.<\/li>\n<\/ul>\n<p><strong>S\u1ed1 l\u01b0\u1ee3ng:<\/strong><\/p>\n<ul>\n<li>M\u1ed9t S\u00e1ch c\u00f3 m\u1ed9t ho\u1eb7c nhi\u1ec1u T\u00e1c gi\u1ea3. (N:1)<\/li>\n<li>M\u1ed9t T\u00e1c gi\u1ea3 vi\u1ebft m\u1ed9t ho\u1eb7c nhi\u1ec1u S\u00e1ch. (N:1)<\/li>\n<li><strong>K\u1ebft qu\u1ea3:<\/strong> Nhi\u1ec1u &#8211; Nhi\u1ec1u.<\/li>\n<\/ul>\n<p><strong>Tri\u1ec3n khai:<\/strong><\/p>\n<ul>\n<li>T\u1ea1o m\u1ed9t b\u1ea3ng li\u00ean k\u1ebft <code>Book_Authors<\/code> b\u1ea3ng li\u00ean k\u1ebft.<\/li>\n<li>C\u00e1c c\u1ed9t: <code>book_id<\/code>, <code>author_id<\/code>.<\/li>\n<li>Tham gia: To\u00e0n b\u1ed9 \u1edf c\u1ea3 hai ph\u00eda. M\u1ed9t b\u1ea3n ghi s\u00e1ch ph\u1ea3i c\u00f3 \u00edt nh\u1ea5t m\u1ed9t t\u00e1c gi\u1ea3.<\/li>\n<\/ul>\n<h2>\ud83d\udcca So s\u00e1nh c\u00e1c r\u00e0ng bu\u1ed9c trong m\u1ed9t b\u1ea3ng<\/h2>\n<p>S\u1eed d\u1ee5ng b\u1ea3ng tham chi\u1ebfu n\u00e0y \u0111\u1ec3 nhanh ch\u00f3ng x\u00e1c \u0111\u1ecbnh c\u00e1c lo\u1ea1i r\u00e0ng bu\u1ed9c trong qu\u00e1 tr\u00ecnh m\u00f4 h\u00ecnh h\u00f3a.<\/p>\n<table>\n<thead>\n<tr>\n<th>Lo\u1ea1i r\u00e0ng bu\u1ed9c<\/th>\n<th>C\u00e2u h\u1ecfi<\/th>\n<th>Tri\u1ec3n khai c\u01a1 s\u1edf d\u1eef li\u1ec7u<\/th>\n<th>V\u00ed d\u1ee5<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>\u0110\u1ed9 cardinality 1:1<\/strong><\/td>\n<td>M\u1ed9t b\u1ea3n ghi c\u00f3 duy nh\u1ea5t \u0111\u1ed1i v\u1edbi b\u1ea3n ghi kia kh\u00f4ng?<\/td>\n<td>Kh\u00f3a ngo\u1ea1i + R\u00e0ng bu\u1ed9c duy nh\u1ea5t<\/td>\n<td>Ng\u01b0\u1eddi d\u00f9ng \u2194 H\u1ed3 s\u01a1<\/td>\n<\/tr>\n<tr>\n<td><strong>\u0110\u1ed9 cardinality 1:N<\/strong><\/td>\n<td>M\u1ed9t b\u1ea3n ghi c\u00f3 li\u00ean k\u1ebft v\u1edbi nhi\u1ec1u b\u1ea3n ghi kh\u00f4ng?<\/td>\n<td>Kh\u00f3a ngo\u1ea1i trong b\u1ea3ng con<\/td>\n<td>Ph\u00f2ng ban \u2194 Nh\u00e2n vi\u00ean<\/td>\n<\/tr>\n<tr>\n<td><strong>\u0110\u1ed9 cardinality M:N<\/strong><\/td>\n<td>C\u1ea3 hai c\u00f3 li\u00ean k\u1ebft v\u1edbi nhi\u1ec1u b\u1ea3n ghi kh\u00f4ng?<\/td>\n<td>B\u1ea3ng li\u00ean k\u1ebft<\/td>\n<td>Sinh vi\u00ean \u2194 Kh\u00f3a h\u1ecdc<\/td>\n<\/tr>\n<tr>\n<td><strong>Tham gia to\u00e0n b\u1ed9<\/strong><\/td>\n<td>Li\u00ean h\u1ec7 n\u00e0y c\u00f3 b\u1eaft bu\u1ed9c kh\u00f4ng?<\/td>\n<td>KH\u00d4NG \u0110\u01af\u1ee2C R\u1ed6NG<\/td>\n<td>Chi ti\u1ebft \u0111\u01a1n h\u00e0ng \u2194 \u0110\u01a1n h\u00e0ng<\/td>\n<\/tr>\n<tr>\n<td><strong>Tham gia m\u1ed9t ph\u1ea7n<\/strong><\/td>\n<td>Li\u00ean h\u1ec7 n\u00e0y c\u00f3 t\u00f9y ch\u1ecdn kh\u00f4ng?<\/td>\n<td>Cho ph\u00e9p r\u1ed7ng<\/td>\n<td>S\u1ea3n ph\u1ea9m \u2194 \u0110\u00e1nh gi\u00e1<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>\u26a0\ufe0f Nh\u1eefng sai l\u1ea7m ph\u1ed5 bi\u1ebfn trong thi\u1ebft k\u1ebf<\/h2>\n<p>Ngay c\u1ea3 nh\u1eefng nh\u00e0 thi\u1ebft k\u1ebf c\u00f3 kinh nghi\u1ec7m c\u0169ng m\u1eafc sai l\u1ea7m. Nh\u1eefng l\u1ed7i n\u00e0y d\u1eabn \u0111\u1ebfn hi\u1ec7n t\u01b0\u1ee3ng b\u1ea5t th\u01b0\u1eddng trong d\u1eef li\u1ec7u v\u00e0 l\u1ed7i \u1ee9ng d\u1ee5ng.<\/p>\n<h3>\u274c Hi\u1ec3u nh\u1ea7m M:N th\u00e0nh 1:N<\/h3>\n<p>Vi\u1ec7c c\u1ed1 g\u1eafng l\u01b0u tr\u1eef m\u1ed1i quan h\u1ec7 Nhi\u1ec1u-\u0111\u1ebfn-Nhi\u1ec1u tr\u1ef1c ti\u1ebfp th\u01b0\u1eddng d\u1eabn \u0111\u1ebfn vi\u1ec7c tr\u00f9ng l\u1eb7p d\u1eef li\u1ec7u.<\/p>\n<ul>\n<li><strong>Sai:<\/strong> Th\u00eam m\u1ed9t <code>course_id<\/code> \u0111\u1ec3 m\u1ed9t <code>sinh vi\u00ean<\/code> b\u1ea3ng. \u0110i\u1ec1u n\u00e0y bu\u1ed9c sinh vi\u00ean ph\u1ea3i ch\u1ecdn m\u1ed9t kh\u00f3a h\u1ecdc ch\u00ednh, b\u1ecf qua c\u00e1c kh\u00f3a h\u1ecdc kh\u00e1c.<\/li>\n<li><strong>\u0110\u00fang:<\/strong> S\u1eed d\u1ee5ng b\u1ea3ng li\u00ean k\u1ebft \u0111\u1ec3 cho ph\u00e9p nhi\u1ec1u \u0111\u0103ng k\u00fd cho m\u1ed7i sinh vi\u00ean.<\/li>\n<\/ul>\n<h3>\u274c L\u1ea1m d\u1ee5ng tham gia to\u00e0n b\u1ed9<\/h3>\n<p>Thi\u1ebft l\u1eadp m\u1ecdi m\u1ed1i quan h\u1ec7 l\u00e0 b\u1eaft bu\u1ed9c s\u1ebd l\u00e0m gi\u1ea3m t\u00ednh linh ho\u1ea1t.<\/p>\n<ul>\n<li><strong>V\u1ea5n \u0111\u1ec1:<\/strong> N\u1ebfu m\u1ed9t <code>Manager<\/code> b\u1ea3ng y\u00eau c\u1ea7u m\u1ed9t <code>Department_ID<\/code> l\u00e0 KH\u00d4NG R\u1ed6NG, b\u1ea1n kh\u00f4ng th\u1ec3 \u0111\u01b0a m\u1ed9t qu\u1ea3n l\u00fd m\u1edbi v\u00e0o h\u1ec7 th\u1ed1ng cho \u0111\u1ebfn khi c\u00f3 m\u1ed9t ph\u00f2ng ban t\u1ed3n t\u1ea1i.<\/li>\n<li><strong>Gi\u1ea3i ph\u00e1p:<\/strong> Cho ph\u00e9p NULL n\u1ebfu qu\u1ea3n l\u00fd c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c \u0111i\u1ec1u chuy\u1ec3n sau n\u00e0y ho\u1eb7c n\u1ebfu c\u00e1c ph\u00f2ng ban \u0111\u01b0\u1ee3c t\u1ea1o theo c\u00e1ch b\u1ea5t \u0111\u1ed3ng b\u1ed9.<\/li>\n<\/ul>\n<h3>\u274c B\u1ecf qua t\u00ednh kh\u1ea3 d\u1ee5ng c\u1ee7a NULL trong M:N<\/h3>\n<p>C\u00e1c b\u1ea3ng li\u00ean k\u1ebft n\u00ean hi\u1ebfm khi cho ph\u00e9p NULL trong c\u00e1c c\u1ed9t kh\u00f3a ngo\u1ea1i c\u1ee7a ch\u00fang.<\/p>\n<ul>\n<li><strong>L\u00fd do:<\/strong> M\u1ed9t li\u00ean k\u1ebft ph\u1ea3i k\u1ebft n\u1ed1i hai th\u1ef1c th\u1ec3 h\u1ee3p l\u1ec7. N\u1ebfu m\u1ed9t h\u00e0ng t\u1ed3n t\u1ea1i trong b\u1ea3ng li\u00ean k\u1ebft, c\u1ea3 hai kh\u00f3a ngo\u1ea1i \u0111\u1ec1u ph\u1ea3i \u0111\u01b0\u1ee3c \u0111i\u1ec1n.<\/li>\n<li><strong>R\u00e0ng bu\u1ed9c:<\/strong> X\u00e1c \u0111\u1ecbnh kh\u00f3a ch\u00ednh h\u1ee3p th\u00e0nh \u0111\u1ec3 ng\u0103n ch\u1eb7n c\u00e1c li\u00ean k\u1ebft tr\u00f9ng l\u1eb7p v\u00e0 \u0111\u1ea3m b\u1ea3o c\u1ea3 hai ID \u0111\u1ec1u c\u00f3 m\u1eb7t.<\/li>\n<\/ul>\n<h2>\ud83d\udee0\ufe0f C\u00e1c c\u00e2n nh\u1eafc v\u1ec1 tri\u1ec3n khai<\/h2>\n<p>M\u1ed9t khi m\u00f4 h\u00ecnh logic \u0111\u00e3 \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh, c\u00e1c r\u00e0ng bu\u1ed9c n\u00e0y s\u1ebd chuy\u1ec3n th\u00e0nh c\u00e1c c\u1ea5u tr\u00fac c\u01a1 s\u1edf d\u1eef li\u1ec7u v\u1eadt l\u00fd. C\u00e1c c\u00e2n nh\u1eafc sau \u0111\u00e2y \u0111\u1ea3m b\u1ea3o t\u00ednh to\u00e0n v\u1eb9n d\u1eef li\u1ec7u.<\/p>\n<h3>\ud83d\udd39 H\u00e0nh \u0111\u1ed9ng kh\u00f3a ngo\u1ea1i<\/h3>\n<p>Khi m\u1ed9t b\u1ea3n ghi cha thay \u0111\u1ed5i ho\u1eb7c x\u00f3a, \u0111i\u1ec1u g\u00ec x\u1ea3y ra v\u1edbi b\u1ea3n ghi con? \u0110i\u1ec1u n\u00e0y \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh b\u1edfi r\u00e0ng bu\u1ed9c tham gia.<\/p>\n<ul>\n<li><strong>CASCADE:<\/strong> N\u1ebfu b\u1ea3n ghi cha b\u1ecb x\u00f3a, b\u1ea3n ghi con c\u0169ng b\u1ecb x\u00f3a. D\u00f9ng khi b\u1ea3n ghi con kh\u00f4ng th\u1ec3 t\u1ed3n t\u1ea1i m\u00e0 kh\u00f4ng c\u00f3 b\u1ea3n ghi cha (tham gia to\u00e0n b\u1ed9).<\/li>\n<li><strong>SET NULL:<\/strong> N\u1ebfu b\u1ea3n ghi cha b\u1ecb x\u00f3a, kh\u00f3a ngo\u1ea1i c\u1ee7a b\u1ea3n ghi con s\u1ebd tr\u1edf th\u00e0nh NULL. D\u00f9ng khi b\u1ea3n ghi con c\u00f3 th\u1ec3 t\u1ed3n t\u1ea1i \u0111\u1ed9c l\u1eadp (tham gia m\u1ed9t ph\u1ea7n).<\/li>\n<li><strong>RESTRICT:<\/strong> Ng\u0103n x\u00f3a n\u1ebfu t\u1ed3n t\u1ea1i c\u00e1c b\u1ea3n ghi con. \u0110\u1ea3m b\u1ea3o t\u00ednh nh\u1ea5t qu\u00e1n d\u1eef li\u1ec7u.<\/li>\n<\/ul>\n<h3>\ud83d\udd39 Chi\u1ebfn l\u01b0\u1ee3c ch\u1ec9 m\u1ee5c h\u00f3a<\/h3>\n<p>C\u00e1c r\u00e0ng bu\u1ed9c \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn hi\u1ec7u su\u1ea5t. C\u00e1c kh\u00f3a ngo\u1ea1i th\u01b0\u1eddng y\u00eau c\u1ea7u ch\u1ec9 m\u1ee5c h\u00f3a \u0111\u1ec3 t\u0103ng t\u1ed1c c\u00e1c thao t\u00e1c n\u1ed1i b\u1ea3ng.<\/p>\n<ul>\n<li><strong>M\u1ed1i quan h\u1ec7 1:N:<\/strong>Ch\u1ec9 m\u1ee5c h\u00f3a c\u1ed9t kh\u00f3a ngo\u1ea1i trong b\u1ea3ng \u201cNhi\u1ec1u\u201d.<\/li>\n<li><strong>M\u1ed1i quan h\u1ec7 M:N:<\/strong>Ch\u1ec9 m\u1ee5c h\u00f3a c\u1ea3 hai kh\u00f3a ngo\u1ea1i trong b\u1ea3ng giao nhau.<\/li>\n<li><strong>M\u1ed1i quan h\u1ec7 1:1:<\/strong>Ch\u1ec9 m\u1ee5c h\u00f3a kh\u00f3a ngo\u1ea1i trong b\u1ea3ng c\u00f3 r\u00e0ng bu\u1ed9c duy nh\u1ea5t.<\/li>\n<\/ul>\n<h3>\ud83d\udd39 X\u00e1c th\u1ef1c \u1edf c\u1ea5p \u0111\u1ed9 \u1ee9ng d\u1ee5ng<\/h3>\n<p>M\u1eb7c d\u00f9 c\u01a1 s\u1edf d\u1eef li\u1ec7u th\u1ef1c thi c\u00e1c quy t\u1eafc, l\u1edbp \u1ee9ng d\u1ee5ng cung c\u1ea5p ph\u1ea3n h\u1ed3i cho ng\u01b0\u1eddi d\u00f9ng.<\/p>\n<ul>\n<li>Ng\u0103n ng\u01b0\u1eddi d\u00f9ng g\u1eedi bi\u1ec3u m\u1eabu vi ph\u1ea1m quy t\u1eafc tham gia (v\u00ed d\u1ee5: l\u01b0u m\u1ed9t \u0111\u01a1n h\u00e0ng m\u00e0 kh\u00f4ng c\u00f3 \u0111\u1ecba ch\u1ec9).<\/li>\n<li>X\u1eed l\u00fd tham gia kh\u00f4ng \u0111\u1ea7y \u0111\u1ee7 m\u1ed9t c\u00e1ch tr\u01a1n tru (v\u00ed d\u1ee5: cho ph\u00e9p t\u1ea1o s\u1ea3n ph\u1ea9m m\u00e0 kh\u00f4ng c\u1ea7n ph\u00e2n b\u1ed5 t\u1ed3n kho ngay l\u1eadp t\u1ee9c).<\/li>\n<\/ul>\n<h2>\ud83e\udde9 Tr\u1ef1c quan h\u00f3a c\u00e1c k\u00fd hi\u1ec7u<\/h2>\n<p>M\u1eb7c d\u00f9 c\u00e1c c\u00f4ng c\u1ee5 ph\u1ea7n m\u1ec1m kh\u00e1c nhau, logic n\u1ec1n t\u1ea3ng v\u1eabn gi\u1eef nguy\u00ean. Hi\u1ec3u \u0111\u01b0\u1ee3c c\u00e1c k\u00fd hi\u1ec7u chu\u1ea9n gi\u00fap giao ti\u1ebfp m\u00f4 h\u00ecnh gi\u1eefa c\u00e1c nh\u00f3m hi\u1ec7u qu\u1ea3 h\u01a1n.<\/p>\n<ul>\n<li><strong>Crow\u2019s Foot:<\/strong> S\u1eed d\u1ee5ng c\u00e1c \u0111\u01b0\u1eddng c\u00f3 nh\u00e1nh (ch\u00e2n qu\u1ea1) \u0111\u1ec3 ch\u1ec9 \u201cNhi\u1ec1u\u201d. M\u1ed9t \u0111\u01b0\u1eddng \u0111\u01a1n ch\u1ec9 \u201cM\u1ed9t\u201d. M\u1ed9t h\u00ecnh tr\u00f2n ch\u1ec9 \u201cT\u00f9y ch\u1ecdn\u201d.<\/li>\n<li><strong>Chen:<\/strong> S\u1eed d\u1ee5ng h\u00ecnh thoi cho m\u1ed1i quan h\u1ec7 v\u00e0 h\u00ecnh elip cho thu\u1ed9c t\u00ednh. C\u00e1c \u0111\u01b0\u1eddng n\u1ed1i c\u00e1c th\u1ef1c th\u1ec3 bi\u1ec3u th\u1ecb t\u00ednh b\u1ed9i s\u1ed1.<\/li>\n<li><strong>UML:<\/strong> S\u1eed d\u1ee5ng c\u00e1c b\u1ed9i s\u1ed1 nh\u01b0 <code>0..1<\/code>, <code>1..*<\/code>, ho\u1eb7c <code>0..*<\/code> \u0111\u1ec3 bi\u1ec3u th\u1ecb c\u00e1c s\u1ed1 l\u01b0\u1ee3ng c\u1ee5 th\u1ec3.<\/li>\n<\/ul>\n<p><strong>\u0110\u1ecdc k\u00fd hi\u1ec7u b\u1ed9i s\u1ed1:<\/strong><\/p>\n<ul>\n<li><code>1<\/code>: Ch\u00ednh x\u00e1c m\u1ed9t.<\/li>\n<li><code>0..1<\/code>: Kh\u00f4ng ho\u1eb7c m\u1ed9t (T\u00f9y ch\u1ecdn).<\/li>\n<li><code>1..*<\/code>: M\u1ed9t ho\u1eb7c nhi\u1ec1u (B\u1eaft bu\u1ed9c).<\/li>\n<li><code>0..*<\/code>: Kh\u00f4ng ho\u1eb7c nhi\u1ec1u (T\u00f9y ch\u1ecdn).<\/li>\n<\/ul>\n<h2>\ud83d\ude80 Ti\u1ebfn b\u01b0\u1edbc v\u1ec1 ph\u00eda tr\u01b0\u1edbc<\/h2>\n<p>\u00c1p d\u1ee5ng \u0111\u00fang c\u00e1c r\u00e0ng bu\u1ed9c n\u00e0y s\u1ebd gi\u1ea3m thi\u1ec3u n\u1ee3 k\u1ef9 thu\u1eadt. Khi b\u1ea1n x\u00e1c \u0111\u1ecbnh ch\u00ednh x\u00e1c t\u00ednh cardinality v\u00e0 s\u1ef1 tham gia, s\u01a1 \u0111\u1ed3 c\u01a1 s\u1edf d\u1eef li\u1ec7u c\u1ee7a b\u1ea1n s\u1ebd tr\u1edf th\u00e0nh m\u1ed9t t\u00e0i li\u1ec7u t\u1ef1 \u0111\u1ed9ng m\u00f4 t\u1ea3 c\u00e1c quy t\u1eafc kinh doanh.<\/p>\n<p>Xem x\u00e9t l\u1ea1i c\u00e1c m\u00f4 h\u00ecnh hi\u1ec7n t\u1ea1i c\u1ee7a b\u1ea1n theo nh\u1eefng nguy\u00ean t\u1eafc n\u00e0y. Ki\u1ec3m tra c\u00e1c kh\u00f3a ngo\u1ea1i c\u1ee7a b\u1ea1n. X\u00e1c minh c\u00e1c r\u00e0ng bu\u1ed9c NOT NULL. \u0110\u1ea3m b\u1ea3o c\u00e1c b\u1ea3ng li\u00ean k\u1ebft \u0111\u01b0\u1ee3c chu\u1ea9n h\u00f3a \u0111\u00fang c\u00e1ch. Nh\u1eefng b\u01b0\u1edbc n\u00e0y c\u1ee7ng c\u1ed1 n\u1ec1n t\u1ea3ng cho ki\u1ebfn tr\u00fac d\u1eef li\u1ec7u c\u1ee7a b\u1ea1n.<\/p>\n<p>B\u1eaft \u0111\u1ea7u b\u1eb1ng vi\u1ec7c ki\u1ec3m to\u00e1n c\u00e1c th\u1ef1c th\u1ec3 quan tr\u1ecdng nh\u1ea5t c\u1ee7a b\u1ea1n. H\u1ecfi xem \u0111i\u1ec1u g\u00ec x\u1ea3y ra n\u1ebfu m\u1ed9t b\u1ea3n ghi b\u1ecb x\u00f3a. H\u1ecfi xem m\u1ed9t b\u1ea3n ghi c\u00f3 th\u1ec3 t\u1ed3n t\u1ea1i m\u00e0 kh\u00f4ng c\u00f3 m\u1ed1i quan h\u1ec7 hay kh\u00f4ng. Nh\u1eefng c\u00e2u tr\u1ea3 l\u1eddi cho nh\u1eefng c\u00e2u h\u1ecfi n\u00e0y s\u1ebd \u0111\u1ecbnh ngh\u0129a \u0111\u1ed9 m\u1ea1nh c\u1ee7a h\u1ec7 th\u1ed1ng c\u1ee7a b\u1ea1n.<\/p>\n<p>C\u00e1c r\u00e0ng bu\u1ed9c r\u00f5 r\u00e0ng d\u1eabn \u0111\u1ebfn d\u1eef li\u1ec7u r\u00f5 r\u00e0ng. D\u1eef li\u1ec7u r\u00f5 r\u00e0ng d\u1eabn \u0111\u1ebfn c\u00e1c quy\u1ebft \u0111\u1ecbnh \u0111\u00e1ng tin c\u1eady. Gi\u1eef c\u00e1c quy t\u1eafc nghi\u00eam ng\u1eb7t, logic r\u00f5 r\u00e0ng v\u00e0 c\u00e1c m\u00f4 h\u00ecnh linh ho\u1ea1t.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>M\u00f4 h\u00ecnh h\u00f3a d\u1eef li\u1ec7u l\u00e0 n\u1ec1n t\u1ea3ng c\u1ee7a c\u00e1c h\u1ec7 th\u1ed1ng ph\u1ea7n m\u1ec1m \u0111\u00e1ng tin c\u1eady. Kh\u00f4ng c\u00f3 c\u00e1c quy t\u1eafc r\u00f5 r\u00e0ng \u0111i\u1ec1u ch\u1ec9nh c\u00e1ch d\u1eef li\u1ec7u li\u00ean&hellip;<\/p>\n","protected":false},"author":1,"featured_media":1575,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_title":"R\u00e0ng bu\u1ed9c Cardinality v\u00e0 Tham gia trong ERD: C\u00e1c v\u00ed d\u1ee5 th\u1ef1c t\u1ebf","_yoast_wpseo_metadesc":"H\u1ecdc v\u1ec1 c\u00e1c r\u00e0ng bu\u1ed9c cardinality v\u00e0 tham gia cho ERD. Kh\u00e1m ph\u00e1 c\u00e1c m\u1ed1i quan h\u1ec7 m\u1ed9t-nhi\u1ec1u, nhi\u1ec1u-nhi\u1ec1u v\u1edbi c\u00e1c v\u00ed d\u1ee5 thi\u1ebft k\u1ebf c\u01a1 s\u1edf d\u1eef li\u1ec7u th\u1ef1c t\u1ebf.","fifu_image_url":"","fifu_image_alt":"","footnotes":""},"categories":[86],"tags":[82,85],"class_list":["post-1574","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-erd","tag-academic","tag-erd"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.1.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>R\u00e0ng bu\u1ed9c Cardinality v\u00e0 Tham gia trong ERD: C\u00e1c v\u00ed d\u1ee5 th\u1ef1c t\u1ebf<\/title>\n<meta name=\"description\" content=\"H\u1ecdc v\u1ec1 c\u00e1c r\u00e0ng bu\u1ed9c cardinality v\u00e0 tham gia cho ERD. 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