{"id":1576,"date":"2026-03-23T11:33:04","date_gmt":"2026-03-23T11:33:04","guid":{"rendered":"https:\/\/www.go-diagram.com\/vi\/database-developer-interview-prep-erd-questions-2\/"},"modified":"2026-03-23T11:33:04","modified_gmt":"2026-03-23T11:33:04","slug":"database-developer-interview-prep-erd-questions-2","status":"publish","type":"post","link":"https:\/\/www.go-diagram.com\/vi\/database-developer-interview-prep-erd-questions-2\/","title":{"rendered":"Chu\u1ea9n b\u1ecb ph\u1ecfng v\u1ea5n v\u1ecb tr\u00ed ph\u00e1t tri\u1ec3n c\u01a1 s\u1edf d\u1eef li\u1ec7u: C\u00e1c c\u00e2u h\u1ecfi ERD thi\u1ebft y\u1ebfu \u0111\u01b0\u1ee3c tr\u1ea3 l\u1eddi"},"content":{"rendered":"<p>Tham gia m\u1ed9t bu\u1ed5i ph\u1ecfng v\u1ea5n k\u1ef9 thu\u1eadt cho v\u1ecb tr\u00ed ph\u00e1t tri\u1ec3n c\u01a1 s\u1edf d\u1eef li\u1ec7u \u0111\u00f2i h\u1ecfi h\u01a1n ch\u1ec9 vi\u1ec7c bi\u1ebft c\u00fa ph\u00e1p SQL. B\u1ea1n ph\u1ea3i th\u1ec3 hi\u1ec7n s\u1ef1 hi\u1ec3u bi\u1ebft s\u00e2u s\u1eafc v\u1ec1 c\u00e1ch d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c c\u1ea5u tr\u00fac, li\u00ean k\u1ebft v\u00e0 duy tr\u00ec. S\u01a1 \u0111\u1ed3 quan h\u1ec7 th\u1ef1c th\u1ec3 (ERD) \u0111\u00f3ng vai tr\u00f2 n\u1ec1n t\u1ea3ng trong m\u00f4 h\u00ecnh h\u00f3a d\u1eef li\u1ec7u. N\u00f3 \u0111\u00f3ng vai tr\u00f2 l\u00e0 b\u1ea3n v\u1ebd tr\u1ef1c quan cho ki\u1ebfn tr\u00fac c\u01a1 s\u1edf d\u1eef li\u1ec7u c\u1ee7a b\u1ea1n.<\/p>\n<p>Nh\u00e0 tuy\u1ec3n d\u1ee5ng s\u1eed d\u1ee5ng c\u00e1c c\u00e2u h\u1ecfi ERD \u0111\u1ec3 \u0111\u00e1nh gi\u00e1 kh\u1ea3 n\u0103ng chuy\u1ec3n \u0111\u1ed5i y\u00eau c\u1ea7u kinh doanh th\u00e0nh c\u00e1c c\u1ea5u tr\u00fac k\u1ef9 thu\u1eadt c\u1ee7a b\u1ea1n. H\u1ecd mu\u1ed1n ki\u1ec3m tra xem b\u1ea1n c\u00f3 hi\u1ec3u r\u00f5 v\u1ec1 t\u00ednh cardinality, chu\u1ea9n h\u00f3a v\u00e0 t\u00ednh to\u00e0n v\u1eb9n d\u1eef li\u1ec7u hay kh\u00f4ng. H\u01b0\u1edbng d\u1eabn n\u00e0y s\u1ebd d\u1eabn d\u1eaft b\u1ea1n qua c\u00e1c kh\u00e1i ni\u1ec7m thi\u1ebft y\u1ebfu v\u00e0 c\u00e1c t\u00ecnh hu\u1ed1ng ph\u1ed5 bi\u1ebfn m\u00e0 b\u1ea1n s\u1ebd g\u1eb7p ph\u1ea3i.<\/p>\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img alt=\"Child's drawing style infographic for database developer interview preparation covering Entity Relationship Diagram (ERD) fundamentals: entities, attributes, relationships, cardinality types (1:1, 1:N, M:N), normalization steps (1NF, 2NF, 3NF), common interview questions, and a library system scenario example, presented with playful crayon textures, bright colors, and simple hand-drawn illustrations for intuitive learning\" decoding=\"async\" src=\"https:\/\/www.go-diagram.com\/wp-content\/uploads\/2026\/03\/erd-interview-prep-infographic-childs-drawing.jpg\"\/><\/figure>\n<\/div>\n<h2>\ud83d\udd0d Hi\u1ec3u r\u00f5 c\u00e1c th\u00e0nh ph\u1ea7n c\u1ed1t l\u00f5i c\u1ee7a m\u1ed9t ERD<\/h2>\n<p>Tr\u01b0\u1edbc khi gi\u1ea3i quy\u1ebft c\u00e1c t\u00ecnh hu\u1ed1ng ph\u1ee9c t\u1ea1p, b\u1ea1n ph\u1ea3i n\u1eafm v\u1eefng c\u00e1c kh\u1ed1i x\u00e2y d\u1ef1ng c\u01a1 b\u1ea3n. M\u1ed9t ERD kh\u00f4ng ch\u1ec9 l\u00e0 m\u1ed9t b\u1ea3n v\u1ebd; n\u00f3 l\u00e0 s\u1ef1 bi\u1ec3u di\u1ec5n c\u1ee7a c\u00e1c quy t\u1eafc v\u00e0 r\u00e0ng bu\u1ed9c.<\/p>\n<ul>\n<li><strong>C\u00e1c th\u1ef1c th\u1ec3:<\/strong> Ch\u00fang \u0111\u1ea1i di\u1ec7n cho c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng ho\u1eb7c kh\u00e1i ni\u1ec7m trong th\u1ebf gi\u1edbi th\u1ef1c, ch\u1eb3ng h\u1ea1n nh\u01b0 Kh\u00e1ch h\u00e0ng, \u0110\u01a1n h\u00e0ng ho\u1eb7c S\u1ea3n ph\u1ea9m. Trong c\u01a1 s\u1edf d\u1eef li\u1ec7u, ch\u00fang \u0111\u01b0\u1ee3c \u00e1nh x\u1ea1 th\u00e0nh c\u00e1c b\u1ea3ng.<\/li>\n<li><strong>Thu\u1ed9c t\u00ednh:<\/strong> \u0110\u00e2y l\u00e0 c\u00e1c thu\u1ed9c t\u00ednh m\u00f4 t\u1ea3 m\u1ed9t th\u1ef1c th\u1ec3. \u0110\u1ed1i v\u1edbi th\u1ef1c th\u1ec3 Kh\u00e1ch h\u00e0ng, c\u00e1c thu\u1ed9c t\u00ednh c\u00f3 th\u1ec3 bao g\u1ed3m T\u00ean, Email v\u00e0 S\u1ed1 \u0111i\u1ec7n tho\u1ea1i. Ch\u00fang \u0111\u01b0\u1ee3c \u00e1nh x\u1ea1 th\u00e0nh c\u00e1c c\u1ed9t.<\/li>\n<li><strong>M\u1ed1i quan h\u1ec7:<\/strong> Ch\u00fang x\u00e1c \u0111\u1ecbnh c\u00e1ch c\u00e1c th\u1ef1c th\u1ec3 t\u01b0\u01a1ng t\u00e1c v\u1edbi nhau. V\u00ed d\u1ee5: M\u1ed9t Kh\u00e1ch h\u00e0ng \u0111\u1eb7t m\u1ed9t \u0110\u01a1n h\u00e0ng. T\u01b0\u01a1ng t\u00e1c n\u00e0y x\u00e1c \u0111\u1ecbnh m\u1ed1i li\u00ean k\u1ebft gi\u1eefa hai b\u1ea3ng.<\/li>\n<\/ul>\n<p>Khi v\u1ebd c\u00e1c s\u01a1 \u0111\u1ed3 n\u00e0y, s\u1ef1 r\u00f5 r\u00e0ng l\u00e0 y\u1ebfu t\u1ed1 then ch\u1ed1t. H\u00e3y s\u1eed d\u1ee5ng k\u00fd hi\u1ec7u chu\u1ea9n \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o c\u00e1c l\u1eadp tr\u00ecnh vi\u00ean kh\u00e1c c\u00f3 th\u1ec3 \u0111\u1ecdc thi\u1ebft k\u1ebf c\u1ee7a b\u1ea1n m\u00e0 kh\u00f4ng b\u1ecb nh\u1ea7m l\u1eabn.<\/p>\n<h2>\ud83d\udcca Cardinality v\u00e0 Tham gia: Trung t\u00e2m c\u1ee7a c\u00e1c m\u1ed1i quan h\u1ec7<\/h2>\n<p>Cardinality x\u00e1c \u0111\u1ecbnh s\u1ed1 l\u01b0\u1ee3ng th\u1ec3 hi\u1ec7n c\u1ee7a m\u1ed9t th\u1ef1c th\u1ec3 c\u00f3 th\u1ec3 ho\u1eb7c ph\u1ea3i li\u00ean k\u1ebft v\u1edbi c\u00e1c th\u1ec3 hi\u1ec7n c\u1ee7a th\u1ef1c th\u1ec3 kh\u00e1c. \u0110\u00e2y th\u01b0\u1eddng l\u00e0 ph\u1ea7n b\u1ecb ki\u1ec3m tra k\u1ef9 l\u01b0\u1ee1ng nh\u1ea5t trong bu\u1ed5i ph\u1ecfng v\u1ea5n.<\/p>\n<p>C\u00f3 b\u1ed1n lo\u1ea1i cardinality ch\u00ednh m\u00e0 b\u1ea1n ph\u1ea3i tho\u1ea3i m\u00e1i gi\u1ea3i th\u00edch:<\/p>\n<ul>\n<li><strong>M\u1ed9t-\u0111\u1ed1i-m\u1ed9t (1:1):<\/strong> M\u1ed9t th\u1ec3 hi\u1ec7n c\u1ee7a Th\u1ef1c th\u1ec3 A li\u00ean k\u1ebft v\u1edbi \u0111\u00fang m\u1ed9t th\u1ec3 hi\u1ec7n c\u1ee7a Th\u1ef1c th\u1ec3 B. V\u00ed d\u1ee5: M\u1ed9t Ng\u01b0\u1eddi c\u00f3 m\u1ed9t H\u1ed9 chi\u1ebfu.<\/li>\n<li><strong>M\u1ed9t-\u0111\u1ed1i-nhi\u1ec1u (1:N):<\/strong> M\u1ed9t th\u1ec3 hi\u1ec7n c\u1ee7a Th\u1ef1c th\u1ec3 A li\u00ean k\u1ebft v\u1edbi nhi\u1ec1u th\u1ec3 hi\u1ec7n c\u1ee7a Th\u1ef1c th\u1ec3 B. V\u00ed d\u1ee5: M\u1ed9t Ph\u00f2ng ban c\u00f3 nhi\u1ec1u Nh\u00e2n vi\u00ean.<\/li>\n<li><strong>Nhi\u1ec1u-\u0111\u1ed1i-m\u1ed9t (N:1):<\/strong> L\u00e0 \u0111\u1ea3o ng\u01b0\u1ee3c c\u1ee7a M\u1ed9t-\u0111\u1ed1i-nhi\u1ec1u. Nhi\u1ec1u th\u1ec3 hi\u1ec7n c\u1ee7a Th\u1ef1c th\u1ec3 A li\u00ean k\u1ebft v\u1edbi m\u1ed9t th\u1ec3 hi\u1ec7n c\u1ee7a Th\u1ef1c th\u1ec3 B.<\/li>\n<li><strong>Nhi\u1ec1u-\u0111\u1ed1i-nhi\u1ec1u (M:N):<\/strong> Nhi\u1ec1u th\u1ec3 hi\u1ec7n c\u1ee7a Th\u1ef1c th\u1ec3 A li\u00ean k\u1ebft v\u1edbi nhi\u1ec1u th\u1ec3 hi\u1ec7n c\u1ee7a Th\u1ef1c th\u1ec3 B. V\u00ed d\u1ee5: Sinh vi\u00ean \u0111\u0103ng k\u00fd v\u00e0o nhi\u1ec1u Kh\u00f3a h\u1ecdc, v\u00e0 c\u00e1c Kh\u00f3a h\u1ecdc c\u00f3 nhi\u1ec1u Sinh vi\u00ean.<\/li>\n<\/ul>\n<p>Nh\u00e0 tuy\u1ec3n d\u1ee5ng th\u01b0\u1eddng y\u00eau c\u1ea7u b\u1ea1n x\u00e1c \u0111\u1ecbnh c\u00e1c m\u1ed1i quan h\u1ec7 n\u00e0y trong m\u1ed9t t\u00ecnh hu\u1ed1ng kinh doanh. B\u1ea1n ph\u1ea3i c\u00f3 kh\u1ea3 n\u0103ng gi\u1ea3i th\u00edch l\u00fd do t\u1ea1i sao m\u1ed9t m\u1ed1i quan h\u1ec7 \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf theo c\u00e1ch nh\u1ea5t \u0111\u1ecbnh.<\/p>\n<h3>B\u1ea3ng tham chi\u1ebfu Cardinality<\/h3>\n<table>\n<thead>\n<tr>\n<th>Lo\u1ea1i m\u1ed1i quan h\u1ec7<\/th>\n<th>K\u00fd hi\u1ec7u<\/th>\n<th>Tri\u1ec3n khai c\u01a1 s\u1edf d\u1eef li\u1ec7u<\/th>\n<th>T\u00ecnh hu\u1ed1ng v\u00ed d\u1ee5<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>M\u1ed9t-\u0111\u1ed1i-m\u1ed9t<\/td>\n<td>1:1<\/td>\n<td>Kh\u00f3a ngo\u1ea1i trong m\u1ed9t b\u1ea3ng<\/td>\n<td>Ng\u01b0\u1eddi d\u00f9ng v\u00e0 h\u1ed3 s\u01a1<\/td>\n<\/tr>\n<tr>\n<td>M\u1ed9t-\u0111a<\/td>\n<td>1:N<\/td>\n<td>Kh\u00f3a ngo\u1ea1i trong b\u1ea3ng &#8216;nhi\u1ec1u&#8217;<\/td>\n<td>T\u00e1c gi\u1ea3 v\u00e0 s\u00e1ch<\/td>\n<\/tr>\n<tr>\n<td>\u0110a-\u0111a<\/td>\n<td>M:N<\/td>\n<td>B\u1ea3ng n\u1ed1i v\u1edbi hai kh\u00f3a ngo\u1ea1i<\/td>\n<td>Sinh vi\u00ean v\u00e0 l\u1edbp h\u1ecdc<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>\ud83e\udde9 Chu\u1ea9n h\u00f3a v\u00e0 thi\u1ebft k\u1ebf s\u01a1 \u0111\u1ed3 ERD<\/h2>\n<p>Chu\u1ea9n h\u00f3a l\u00e0 qu\u00e1 tr\u00ecnh t\u1ed5 ch\u1ee9c d\u1eef li\u1ec7u nh\u1eb1m gi\u1ea3m thi\u1ec3u s\u1ef1 tr\u00f9ng l\u1eb7p v\u00e0 c\u1ea3i thi\u1ec7n t\u00ednh to\u00e0n v\u1eb9n. M\u1eb7c d\u00f9 th\u01b0\u1eddng \u0111\u01b0\u1ee3c gi\u1ea3ng d\u1ea1y ri\u00eang bi\u1ec7t, nh\u01b0ng chu\u1ea9n h\u00f3a tr\u1ef1c ti\u1ebfp \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn c\u00e1ch b\u1ea1n v\u1ebd s\u01a1 \u0111\u1ed3 ERD c\u1ee7a m\u00ecnh.<\/p>\n<p>Trong bu\u1ed5i ph\u1ecfng v\u1ea5n, b\u1ea1n c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c y\u00eau c\u1ea7u l\u1ea5y m\u1ed9t b\u1ed9 y\u00eau c\u1ea7u l\u1ed9n x\u1ed9n v\u00e0 chu\u1ea9n h\u00f3a ch\u00fang. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 c\u00e1ch ti\u1ebfp c\u1eadn v\u1ea5n \u0111\u1ec1:<\/p>\n<ul>\n<li><strong>D\u1ea1ng chu\u1ea9n th\u1ee9 nh\u1ea5t (1NF):<\/strong> \u0110\u1ea3m b\u1ea3o m\u1ecdi c\u1ed9t ch\u1ee9a c\u00e1c gi\u00e1 tr\u1ecb nguy\u00ean t\u1eed. Kh\u00f4ng c\u00f3 nh\u00f3m l\u1eb7p l\u1ea1i. M\u1ed7i h\u00e0ng ph\u1ea3i l\u00e0 duy nh\u1ea5t.<\/li>\n<li><strong>D\u1ea1ng chu\u1ea9n th\u1ee9 hai (2NF):<\/strong> \u0110\u00e1p \u1ee9ng c\u00e1c y\u00eau c\u1ea7u c\u1ee7a 1NF v\u00e0 \u0111\u1ea3m b\u1ea3o t\u1ea5t c\u1ea3 c\u00e1c thu\u1ed9c t\u00ednh kh\u00f4ng kh\u00f3a \u0111\u1ec1u ph\u1ee5 thu\u1ed9c ho\u00e0n to\u00e0n v\u00e0o kh\u00f3a ch\u00ednh. Lo\u1ea1i b\u1ecf c\u00e1c ph\u1ee5 thu\u1ed9c ri\u00eang ph\u1ea7n.<\/li>\n<li><strong>D\u1ea1ng chu\u1ea9n th\u1ee9 ba (3NF):<\/strong> \u0110\u00e1p \u1ee9ng c\u00e1c y\u00eau c\u1ea7u c\u1ee7a 2NF v\u00e0 lo\u1ea1i b\u1ecf c\u00e1c ph\u1ee5 thu\u1ed9c b\u1eafc c\u1ea7u. C\u00e1c thu\u1ed9c t\u00ednh kh\u00f4ng kh\u00f3a kh\u00f4ng \u0111\u01b0\u1ee3c ph\u1ee5 thu\u1ed9c v\u00e0o c\u00e1c thu\u1ed9c t\u00ednh kh\u00f4ng kh\u00f3a kh\u00e1c.<\/li>\n<\/ul>\n<p>H\u00e3y xem x\u00e9t m\u1ed9t t\u00ecnh hu\u1ed1ng m\u00e0 b\u1ea1n c\u00f3 m\u1ed9t b\u1ea3ng duy nh\u1ea5t ch\u1ee9a T\u00ean nh\u00e2n vi\u00ean, T\u00ean ph\u00f2ng ban v\u00e0 Tr\u01b0\u1edfng ph\u00f2ng ban. N\u1ebfu tr\u01b0\u1edfng ph\u00f2ng ban thay \u0111\u1ed5i, b\u1ea1n ph\u1ea3i c\u1eadp nh\u1eadt m\u1ecdi h\u00e0ng li\u00ean quan \u0111\u1ebfn ph\u00f2ng ban \u0111\u00f3. \u0110i\u1ec1u n\u00e0y vi ph\u1ea1m 3NF. M\u1ed9t s\u01a1 \u0111\u1ed3 ERD h\u1ee3p l\u00fd s\u1ebd t\u00e1ch ri\u00eang th\u1ef1c th\u1ec3 Ph\u00f2ng ban kh\u1ecfi th\u1ef1c th\u1ec3 Nh\u00e2n vi\u00ean.<\/p>\n<h2>\u2753 C\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n ph\u1ed5 bi\u1ebfn &amp; C\u00e2u tr\u1ea3 l\u1eddi chi ti\u1ebft<\/h2>\n<p>Luy\u1ec7n t\u1eadp c\u00e1c c\u00e2u h\u1ecfi c\u1ee5 th\u1ec3 gi\u00fap b\u1ea1n di\u1ec5n \u0111\u1ea1t suy ngh\u0129 m\u1ed9t c\u00e1ch r\u00f5 r\u00e0ng d\u01b0\u1edbi \u00e1p l\u1ef1c. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 c\u00e1c c\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p v\u00e0 logic \u0111\u1eb1ng sau nh\u1eefng c\u00e2u tr\u1ea3 l\u1eddi m\u1ea1nh m\u1ebd.<\/p>\n<h3>C\u00e2u h\u1ecfi 1: B\u1ea1n x\u1eed l\u00fd m\u1ed1i quan h\u1ec7 Nhi\u1ec1u-\u0111a nh\u01b0 th\u1ebf n\u00e0o?<\/h3>\n<p><strong>Chi\u1ebfn l\u01b0\u1ee3c tr\u1ea3 l\u1eddi:<\/strong> Gi\u1ea3i th\u00edch nhu c\u1ea7u v\u1ec1 m\u1ed9t b\u1ea3ng n\u1ed1i.<\/p>\n<ul>\n<li><strong>Gi\u1ea3i th\u00edch:<\/strong>C\u00e1c h\u1ec7 th\u1ed1ng c\u01a1 s\u1edf d\u1eef li\u1ec7u th\u01b0\u1eddng kh\u00f4ng h\u1ed7 tr\u1ee3 tr\u1ef1c ti\u1ebfp m\u1ed1i quan h\u1ec7 Nhi\u1ec1u-\u0111a.<\/li>\n<li><strong>Gi\u1ea3i ph\u00e1p:<\/strong>T\u00f4i gi\u1edbi thi\u1ec7u m\u1ed9t th\u1ef1c th\u1ec3 li\u00ean k\u1ebft, th\u01b0\u1eddng \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 b\u1ea3ng n\u1ed1i ho\u1eb7c b\u1ea3ng c\u1ea7u n\u1ed1i.<\/li>\n<li><strong>Th\u1ef1c hi\u1ec7n:<\/strong> B\u1ea3ng m\u1edbi n\u00e0y ch\u1ee9a c\u00e1c kh\u00f3a ngo\u1ea1i tham chi\u1ebfu \u0111\u1ebfn c\u00e1c kh\u00f3a ch\u00ednh c\u1ee7a c\u1ea3 hai th\u1ef1c th\u1ec3 li\u00ean quan. \u0110i\u1ec1u n\u00e0y chia m\u1ed1i quan h\u1ec7 M:N th\u00e0nh hai m\u1ed1i quan h\u1ec7 M\u1ed9t-\u0110a.<\/li>\n<li><strong>L\u1ee3i \u00edch:<\/strong> N\u00f3 cho ph\u00e9p l\u01b0u tr\u1eef th\u00eam c\u00e1c thu\u1ed9c t\u00ednh tr\u00ean ch\u00ednh m\u1ed1i quan h\u1ec7, ch\u1eb3ng h\u1ea1n nh\u01b0 ng\u00e0y tham gia ho\u1eb7c vai tr\u00f2 trong m\u1ed1i quan h\u1ec7.<\/li>\n<\/ul>\n<h3>C\u00e2u h\u1ecfi 2: Khi n\u00e0o b\u1ea1n s\u1ebd ch\u1ecdn kh\u00f3a gi\u1ea3 thay v\u00ec kh\u00f3a t\u1ef1 nhi\u00ean?<\/h3>\n<p><strong>Chi\u1ebfn l\u01b0\u1ee3c tr\u1ea3 l\u1eddi:<\/strong> Th\u1ea3o lu\u1eadn v\u1ec1 t\u00ednh \u1ed5n \u0111\u1ecbnh, hi\u1ec7u su\u1ea5t v\u00e0 t\u00ednh linh ho\u1ea1t.<\/p>\n<ul>\n<li><strong>Kh\u00f3a t\u1ef1 nhi\u00ean:<\/strong> \u0110\u00e2y l\u00e0 c\u00e1c \u0111\u1ecbnh danh do doanh nghi\u1ec7p x\u00e1c \u0111\u1ecbnh (v\u00ed d\u1ee5: S\u1ed1 b\u1ea3o hi\u1ec3m x\u00e3 h\u1ed9i, Email). Ch\u00fang c\u00f3 th\u1ec3 thay \u0111\u1ed5i ho\u1eb7c kh\u00f4ng kh\u1ea3 d\u1ee5ng.<\/li>\n<li><strong>Kh\u00f3a gi\u1ea3:<\/strong> \u0110\u00e2y l\u00e0 c\u00e1c kh\u00f3a \u0111\u01b0\u1ee3c h\u1ec7 th\u1ed1ng sinh ra (v\u00ed d\u1ee5: s\u1ed1 nguy\u00ean t\u1ef1 t\u0103ng ho\u1eb7c UUID).<\/li>\n<li><strong>Khuy\u1ebfn ngh\u1ecb:<\/strong> T\u00f4i \u01b0u ti\u00ean s\u1eed d\u1ee5ng kh\u00f3a gi\u1ea3 cho kh\u00f3a ch\u00ednh trong ph\u1ea7n l\u1edbn h\u1ec7 th\u1ed1ng doanh nghi\u1ec7p. Ch\u00fang \u0111\u1ea3m b\u1ea3o t\u00ednh \u1ed5n \u0111\u1ecbnh ngay c\u1ea3 khi d\u1eef li\u1ec7u kinh doanh thay \u0111\u1ed5i. Ch\u00fang c\u0169ng t\u1ed1i \u01b0u hi\u1ec7u su\u1ea5t truy v\u1ea5n k\u1ebft h\u1ee3p v\u00ec s\u1ed1 nguy\u00ean x\u1eed l\u00fd nhanh h\u01a1n chu\u1ed7i d\u00e0i.<\/li>\n<\/ul>\n<h3>C\u00e2u h\u1ecfi 3: B\u1ea1n x\u1eed l\u00fd m\u1ed1i quan h\u1ec7 \u0111\u1ec7 quy nh\u01b0 th\u1ebf n\u00e0o?<\/h3>\n<p><strong>Chi\u1ebfn l\u01b0\u1ee3c tr\u1ea3 l\u1eddi:<\/strong> Gi\u1ea3i th\u00edch c\u00e1c c\u1ea5u tr\u00fac d\u1eef li\u1ec7u ph\u00e2n c\u1ea5p.<\/p>\n<ul>\n<li><strong>\u0110\u1ecbnh ngh\u0129a:<\/strong> M\u1ed1i quan h\u1ec7 \u0111\u1ec7 quy x\u1ea3y ra khi m\u1ed9t th\u1ef1c th\u1ec3 li\u00ean k\u1ebft v\u1edbi ch\u00ednh n\u00f3.<\/li>\n<li><strong>V\u00ed d\u1ee5:<\/strong> M\u1ed9t th\u1ef1c th\u1ec3 Nh\u00e2n vi\u00ean m\u00e0 m\u1ed9t Nh\u00e2n vi\u00ean c\u00f3 th\u1ec3 qu\u1ea3n l\u00fd c\u00e1c Nh\u00e2n vi\u00ean kh\u00e1c.<\/li>\n<li><strong>Th\u1ef1c hi\u1ec7n:<\/strong> B\u1ea3ng bao g\u1ed3m m\u1ed9t c\u1ed9t kh\u00f3a ngo\u1ea1i tham chi\u1ebfu t\u1ef1 th\u00e2n (v\u00ed d\u1ee5: ManagerID tr\u1ecf ng\u01b0\u1ee3c l\u1ea1i EmployeeID).<\/li>\n<li><strong>L\u01b0u \u00fd:<\/strong> C\u1ea7n l\u01b0u \u00fd c\u00e1c gi\u00e1 tr\u1ecb null cho c\u00e1c n\u00fat g\u1ed1c (qu\u1ea3n l\u00fd c\u1ea5p cao nh\u1ea5t) v\u00e0 \u0111\u1ea3m b\u1ea3o r\u00e0ng bu\u1ed9c c\u01a1 s\u1edf d\u1eef li\u1ec7u cho ph\u00e9p \u0111i\u1ec1u n\u00e0y.<\/li>\n<\/ul>\n<h3>C\u00e2u h\u1ecfi 4: S\u1ef1 kh\u00e1c bi\u1ec7t gi\u1eefa th\u1ef1c th\u1ec3 Y\u1ebfu v\u00e0 Th\u1ef1c th\u1ec3 M\u1ea1nh l\u00e0 g\u00ec?<\/h3>\n<p><strong>Chi\u1ebfn l\u01b0\u1ee3c tr\u1ea3 l\u1eddi:<\/strong> T\u1eadp trung v\u00e0o s\u1ef1 ph\u1ee5 thu\u1ed9c v\u00e0 nh\u1eadn di\u1ec7n.<\/p>\n<ul>\n<li><strong>Th\u1ef1c th\u1ec3 M\u1ea1nh:<\/strong> C\u00f3 kh\u00f3a ch\u00ednh x\u00e1c \u0111\u1ecbnh duy nh\u1ea5t n\u00f3 \u0111\u1ed9c l\u1eadp v\u1edbi c\u00e1c b\u1ea3ng kh\u00e1c.<\/li>\n<li><strong>Th\u1ef1c th\u1ec3 Y\u1ebfu:<\/strong> Kh\u00f4ng c\u00f3 kh\u00f3a ch\u00ednh ri\u00eang v\u00e0 ph\u1ee5 thu\u1ed9c v\u00e0o kh\u00f3a ngo\u1ea1i t\u1eeb m\u1ed9t th\u1ef1c th\u1ec3 cha \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh.<\/li>\n<li><strong>V\u00ed d\u1ee5:<\/strong> M\u1ed9t &#8220;M\u1ee5c h\u00e0ng&#8221; trong m\u1ed9t \u0111\u01a1n h\u00e0ng kh\u00f4ng th\u1ec3 t\u1ed3n t\u1ea1i n\u1ebfu kh\u00f4ng c\u00f3 &#8220;\u0110\u01a1n h\u00e0ng&#8221;. Kh\u00f3a ch\u00ednh cho M\u1ee5c h\u00e0ng th\u01b0\u1eddng l\u00e0 t\u1ed5 h\u1ee3p c\u1ee7a ID \u0110\u01a1n h\u00e0ng v\u00e0 S\u1ed1 th\u1ee9 t\u1ef1 M\u1ee5c h\u00e0ng.<\/li>\n<\/ul>\n<h2>\u2699\ufe0f Nh\u1eefng c\u00e2n nh\u1eafc n\u00e2ng cao cho c\u00e1c m\u00f4 h\u00ecnh ph\u1ee9c t\u1ea1p<\/h2>\n<p>C\u00e1c v\u1ecb tr\u00ed c\u1ea5p cao th\u01b0\u1eddng y\u00eau c\u1ea7u b\u1ea1n suy ngh\u0129 v\u01b0\u1ee3t ra ngo\u00e0i c\u00e1c s\u01a1 \u0111\u1ed3 c\u01a1 b\u1ea3n. B\u1ea1n ph\u1ea3i c\u00e2n nh\u1eafc \u0111\u1ebfn hi\u1ec7u su\u1ea5t v\u00e0 b\u1ea3o tr\u00ec.<\/p>\n<ul>\n<li><strong>X\u00f3a lan truy\u1ec1n:<\/strong> X\u00e1c \u0111\u1ecbnh \u0111i\u1ec1u g\u00ec x\u1ea3y ra khi m\u1ed9t b\u1ea3n ghi cha b\u1ecb x\u00f3a. C\u00e1c b\u1ea3n ghi con c\u00f3 n\u00ean b\u1ecb x\u00f3a t\u1ef1 \u0111\u1ed9ng, di chuy\u1ec3n \u0111\u1ebfn m\u1ed9t gi\u00e1 tr\u1ecb m\u1eb7c \u0111\u1ecbnh, hay b\u1ecb ch\u1eb7n? \u0110i\u1ec1u n\u00e0y \u0111\u00f2i h\u1ecfi thi\u1ebft k\u1ebf c\u1ea9n th\u1eadn trong s\u01a1 \u0111\u1ed3 ERD.<\/li>\n<li><strong>X\u00f3a m\u1ec1m:<\/strong> Thay v\u00ec x\u00f3a b\u1ea3n ghi m\u1ed9t c\u00e1ch v\u1eadt l\u00fd, h\u00e3y th\u00eam m\u1ed9t th\u1eddi \u0111i\u1ec3m \u0111\u00e1nh d\u1ea5u &#8220;DeletedAt&#8221;. \u0110i\u1ec1u n\u00e0y gi\u00fap b\u1ea3o t\u1ed3n l\u1ecbch s\u1eed v\u00e0 c\u00e1c m\u1ed1i quan h\u1ec7.<\/li>\n<li><strong>C\u00e1c m\u1eabu ki\u1ebfn tr\u00fac:<\/strong> Hi\u1ec3u khi n\u00e0o n\u00ean s\u1eed d\u1ee5ng s\u01a1 \u0111\u1ed3 sao cho b\u00e1o c\u00e1o thay v\u00ec s\u01a1 \u0111\u1ed3 chu\u1ea9n h\u00f3a cho x\u1eed l\u00fd giao d\u1ecbch. S\u01a1 \u0111\u1ed3 ERD thay \u0111\u1ed5i t\u00f9y theo kh\u1ed1i l\u01b0\u1ee3ng c\u00f4ng vi\u1ec7c.<\/li>\n<\/ul>\n<h2>\ud83d\udcdd C\u00e1c th\u1ef1c h\u00e0nh t\u1ed1t nh\u1ea5t khi v\u1ebd s\u01a1 \u0111\u1ed3 ERD<\/h2>\n<p>Ngay c\u1ea3 khi b\u1ea1n kh\u00f4ng v\u1ebd b\u1eb1ng tay, m\u00f4 h\u00ecnh kh\u00e1i ni\u1ec7m c\u1ee7a b\u1ea1n ph\u1ea3i h\u1ee3p l\u00fd. Tu\u00e2n theo c\u00e1c h\u01b0\u1edbng d\u1eabn n\u00e0y \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o thi\u1ebft k\u1ebf c\u1ee7a b\u1ea1n chuy\u00ean nghi\u1ec7p v\u00e0 d\u1ec5 b\u1ea3o tr\u00ec.<\/p>\n<ul>\n<li><strong>T\u00ean g\u1ecdi nh\u1ea5t qu\u00e1n:<\/strong> S\u1eed d\u1ee5ng danh t\u1eeb s\u1ed1 \u00edt cho c\u00e1c th\u1ef1c th\u1ec3 (v\u00ed d\u1ee5: &#8220;Kh\u00e1ch h\u00e0ng&#8221; ch\u1ee9 kh\u00f4ng ph\u1ea3i &#8220;Kh\u00e1ch h\u00e0ng&#8221;). S\u1eed d\u1ee5ng t\u00ean r\u00f5 r\u00e0ng, m\u00f4 t\u1ea3 cho c\u00e1c thu\u1ed9c t\u00ednh.<\/li>\n<li><strong>K\u00fd hi\u1ec7u r\u00f5 r\u00e0ng:<\/strong> Duy tr\u00ec m\u1ed9t chu\u1ea9n nh\u01b0 k\u00fd hi\u1ec7u Crow\u2019s Foot ho\u1eb7c k\u00fd hi\u1ec7u Chen. Kh\u00f4ng \u0111\u01b0\u1ee3c tr\u1ed9n c\u00e1c phong c\u00e1ch trong c\u00f9ng m\u1ed9t s\u01a1 \u0111\u1ed3.<\/li>\n<li><strong>Chi\u1ebfn l\u01b0\u1ee3c ch\u1ec9 m\u1ee5c:<\/strong> M\u1eb7c d\u00f9 kh\u00f4ng ph\u1ea3i l\u00fac n\u00e0o c\u0169ng \u0111\u01b0\u1ee3c v\u1ebd tr\u00ean s\u01a1 \u0111\u1ed3, h\u00e3y bi\u1ebft c\u00e1c c\u1ed9t n\u00e0o s\u1ebd \u0111\u01b0\u1ee3c ch\u1ec9 m\u1ee5c d\u1ef1a tr\u00ean c\u00e1c m\u1ed1i quan h\u1ec7 \u0111\u00e3 x\u00e1c \u0111\u1ecbnh.<\/li>\n<li><strong>T\u00e0i li\u1ec7u:<\/strong> Th\u00eam ghi ch\u00fa \u0111\u1ec3 gi\u1ea3i th\u00edch logic ph\u1ee9c t\u1ea1p ho\u1eb7c c\u00e1c quy t\u1eafc kinh doanh m\u00e0 kh\u00f4ng th\u1ec3 bi\u1ec3u di\u1ec5n ch\u1ec9 b\u1eb1ng c\u00e1c \u0111\u01b0\u1eddng v\u00e0 h\u00ecnh h\u1ed9p.<\/li>\n<\/ul>\n<h2>\ud83d\udee0\ufe0f C\u00f4ng c\u1ee5 so v\u1edbi Kh\u00e1i ni\u1ec7m<\/h2>\n<p>Th\u01b0\u1eddng xuy\u00ean b\u1ecb h\u1ecfi v\u1ec1 c\u00e1c c\u00f4ng c\u1ee5 b\u1ea1n s\u1eed d\u1ee5ng \u0111\u1ec3 m\u00f4 h\u00ecnh h\u00f3a. Tuy nhi\u00ean, tr\u1ecdng t\u00e2m lu\u00f4n ph\u1ea3i n\u1eb1m \u1edf c\u00e1c kh\u00e1i ni\u1ec7m.<\/p>\n<ul>\n<li><strong>M\u00f4 h\u00ecnh kh\u00e1i ni\u1ec7m:<\/strong> C\u00e1c s\u01a1 \u0111\u1ed3 c\u1ea5p cao ghi l\u1ea1i c\u00e1c quy t\u1eafc kinh doanh m\u00e0 kh\u00f4ng c\u1ea7n chi ti\u1ebft k\u1ef9 thu\u1eadt.<\/li>\n<li><strong>M\u00f4 h\u00ecnh logic:<\/strong> Bao g\u1ed3m ki\u1ec3u d\u1eef li\u1ec7u, kh\u00f3a v\u00e0 m\u1ed1i quan h\u1ec7, nh\u01b0ng v\u1eabn \u0111\u1ed9c l\u1eadp v\u1edbi ph\u1ea7n m\u1ec1m c\u01a1 s\u1edf d\u1eef li\u1ec7u c\u1ee5 th\u1ec3.<\/li>\n<li><strong>M\u00f4 h\u00ecnh v\u1eadt l\u00fd:<\/strong> S\u01a1 \u0111\u1ed3 tri\u1ec3n khai cu\u1ed1i c\u00f9ng bao g\u1ed3m c\u00e1c r\u00e0ng bu\u1ed9c c\u1ee5 th\u1ec3 v\u00e0 c\u00e1c tham s\u1ed1 l\u01b0u tr\u1eef.<\/li>\n<\/ul>\n<p>Nh\u00e0 tuy\u1ec3n d\u1ee5ng \u0111\u00e1nh gi\u00e1 cao \u1ee9ng vi\u00ean c\u00f3 th\u1ec3 gi\u1ea3i th\u00edch m\u00f4 h\u00ecnh logic tr\u01b0\u1edbc khi lo l\u1eafng v\u1ec1 tri\u1ec3n khai v\u1eadt l\u00fd. N\u1ebfu b\u1ea1n hi\u1ec3u c\u1ea5u tr\u00fac d\u1eef li\u1ec7u, b\u1ea1n c\u00f3 th\u1ec3 th\u00edch nghi v\u1edbi b\u1ea5t k\u1ef3 h\u1ec7 th\u1ed1ng n\u00e0o.<\/p>\n<h2>\ud83e\udde0 Gi\u1ea3i quy\u1ebft v\u1ea5n \u0111\u1ec1 theo t\u00ecnh hu\u1ed1ng<\/h2>\n<p>H\u00e3y chu\u1ea9n b\u1ecb cho c\u00e1c c\u00e2u h\u1ecfi thi\u1ebft k\u1ebf m\u1edf. B\u1ea1n c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c \u0111\u01b0a ra m\u1ed9t y\u00eau c\u1ea7u m\u01a1 h\u1ed3 v\u00e0 \u0111\u01b0\u1ee3c y\u00eau c\u1ea7u ph\u00e1c th\u1ea3o m\u1ed9t gi\u1ea3i ph\u00e1p.<\/p>\n<p><strong>T\u00ecnh hu\u1ed1ng: Thi\u1ebft k\u1ebf m\u1ed9t h\u1ec7 th\u1ed1ng th\u01b0 vi\u1ec7n<\/strong><\/p>\n<ul>\n<li><strong>C\u00e1c th\u1ef1c th\u1ec3:<\/strong> S\u00e1ch, T\u00e1c gi\u1ea3, Th\u00e0nh vi\u00ean, Giao d\u1ecbch m\u01b0\u1ee3n.<\/li>\n<li><strong>C\u00e1c m\u1ed1i quan h\u1ec7:<\/strong>\n<ul>\n<li>C\u00e1c t\u00e1c gi\u1ea3 vi\u1ebft s\u00e1ch (m\u1ed9t-nhi\u1ec1u).<\/li>\n<li>C\u00e1c th\u00e0nh vi\u00ean m\u01b0\u1ee3n s\u00e1ch (nhi\u1ec1u-nhi\u1ec1u, \u0111\u01b0\u1ee3c gi\u1ea3i quy\u1ebft th\u00f4ng qua th\u1ef1c th\u1ec3 Giao d\u1ecbch m\u01b0\u1ee3n).<\/li>\n<li>S\u00e1ch c\u00f3 nhi\u1ec1u t\u00e1c gi\u1ea3 (nhi\u1ec1u-nhi\u1ec1u, \u0111\u01b0\u1ee3c gi\u1ea3i quy\u1ebft th\u00f4ng qua b\u1ea3ng li\u00ean k\u1ebft BookAuthor).<\/li>\n<\/ul>\n<\/li>\n<li><strong>Thu\u1ed9c t\u00ednh:<\/strong> Theo d\u00f5i ng\u00e0y m\u01b0\u1ee3n, ng\u00e0y \u0111\u1ebfn h\u1ea1n v\u00e0 ph\u1ea1t ti\u1ec1n.<\/li>\n<\/ul>\n<p>Khi tr\u1ea3 l\u1eddi, h\u00e3y d\u1eabn d\u1eaft ng\u01b0\u1eddi ph\u1ecfng v\u1ea5n qua qu\u00e1 tr\u00ecnh suy ngh\u0129 c\u1ee7a b\u1ea1n. \u0110\u1eb7t c\u00e1c c\u00e2u h\u1ecfi l\u00e0m r\u00f5. V\u00ed d\u1ee5: \u201cCh\u00fang ta c\u00f3 c\u1ea7n theo d\u00f5i d\u1eef li\u1ec7u m\u01b0\u1ee3n l\u1ecbch s\u1eed hay ch\u1ec9 c\u00e1c giao d\u1ecbch m\u01b0\u1ee3n hi\u1ec7n t\u1ea1i kh\u00f4ng?\u201d \u0110i\u1ec1u n\u00e0y cho th\u1ea5y b\u1ea1n suy ngh\u0129 v\u1ec1 y\u00eau c\u1ea7u, ch\u1ee9 kh\u00f4ng ch\u1ec9 v\u1ec1 c\u00fa ph\u00e1p.<\/p>\n<h2>\ud83d\udd12 T\u00ednh to\u00e0n v\u1eb9n d\u1eef li\u1ec7u v\u00e0 c\u00e1c r\u00e0ng bu\u1ed9c<\/h2>\n<p>M\u1ed9t s\u01a1 \u0111\u1ed3 ERD s\u1ebd v\u00f4 d\u1ee5ng n\u1ebfu n\u00f3 kh\u00f4ng th\u1ef1c thi c\u00e1c quy t\u1eafc. H\u00e3y th\u1ea3o lu\u1eadn c\u00e1ch b\u1ea1n \u0111\u1ea3m b\u1ea3o ch\u1ea5t l\u01b0\u1ee3ng d\u1eef li\u1ec7u.<\/p>\n<ul>\n<li><strong>Kh\u00f3a ch\u00ednh:<\/strong> \u0110\u1ea3m b\u1ea3o t\u00ednh duy nh\u1ea5t.<\/li>\n<li><strong>Kh\u00f3a ngo\u1ea1i:<\/strong> \u0110\u1ea3m b\u1ea3o t\u00ednh to\u00e0n v\u1eb9n tham chi\u1ebfu gi\u1eefa c\u00e1c b\u1ea3ng.<\/li>\n<li><strong>R\u00e0ng bu\u1ed9c ki\u1ec3m tra:<\/strong> X\u00e1c th\u1ef1c c\u00e1c gi\u00e1 tr\u1ecb c\u1ee5 th\u1ec3 (v\u00ed d\u1ee5: Tu\u1ed5i ph\u1ea3i l\u1edbn h\u01a1n 0).<\/li>\n<li><strong>R\u00e0ng bu\u1ed9c duy nh\u1ea5t:<\/strong> \u0110\u1ea3m b\u1ea3o c\u00e1c c\u1ed9t c\u1ee5 th\u1ec3 (nh\u01b0 Email) kh\u00f4ng c\u00f3 gi\u00e1 tr\u1ecb tr\u00f9ng l\u1eb7p.<\/li>\n<\/ul>\n<h2>\ud83c\udfc1 Nh\u1eefng suy ngh\u0129 cu\u1ed1i c\u00f9ng v\u1ec1 vi\u1ec7c chu\u1ea9n b\u1ecb<\/h2>\n<p>Chu\u1ea9n b\u1ecb cho ph\u1ecfng v\u1ea5n c\u01a1 s\u1edf d\u1eef li\u1ec7u l\u00e0 v\u1ec1 vi\u1ec7c x\u00e2y d\u1ef1ng c\u00e1c m\u00f4 h\u00ecnh t\u01b0 duy. H\u00e3y luy\u1ec7n t\u1eadp v\u1ebd s\u01a1 \u0111\u1ed3 cho c\u00e1c h\u1ec7 th\u1ed1ng h\u00e0ng ng\u00e0y nh\u01b0 n\u1ec1n t\u1ea3ng m\u1ea1ng x\u00e3 h\u1ed9i, trang th\u01b0\u01a1ng m\u1ea1i \u0111i\u1ec7n t\u1eed ho\u1eb7c qu\u1ea3n l\u00fd kho h\u00e0ng.<\/p>\n<ul>\n<li><strong>\u00d4n l\u1ea1i c\u00e1c ki\u1ebfn th\u1ee9c n\u1ec1n t\u1ea3ng:<\/strong> \u00d4n l\u1ea1i c\u00e1c quy t\u1eafc chu\u1ea9n h\u00f3a v\u00e0 c\u00e1c lo\u1ea1i m\u1ed1i quan h\u1ec7.<\/li>\n<li><strong>Luy\u1ec7n t\u1eadp c\u00e1c t\u00ecnh hu\u1ed1ng:<\/strong> L\u1ea5y c\u00e1c y\u00eau c\u1ea7u kinh doanh v\u00e0 chuy\u1ec3n \u0111\u1ed5i ch\u00fang th\u00e0nh c\u00e1c b\u1ea3ng.<\/li>\n<li><strong>Gi\u1ea3i th\u00edch l\u00fd do c\u1ee7a b\u1ea1n:<\/strong> Khi b\u1ea1n tr\u00ecnh b\u00e0y m\u1ed9t thi\u1ebft k\u1ebf, h\u00e3y gi\u1ea3i th\u00edch l\u00fd do v\u00ec sao b\u1ea1n \u0111\u01b0a ra m\u1ed7i l\u1ef1a ch\u1ecdn. L\u00fd do \u201ct\u1ea1i sao\u201d th\u01b0\u1eddng quan tr\u1ecdng h\u01a1n so v\u1edbi \u201cc\u00e1i g\u00ec\u201d.<\/li>\n<\/ul>\n<p>B\u1eb1ng c\u00e1ch t\u1eadp trung v\u00e0o nh\u1eefng nguy\u00ean t\u1eafc c\u1ed1t l\u00f5i n\u00e0y v\u00e0 luy\u1ec7n t\u1eadp giao ti\u1ebfp r\u00f5 r\u00e0ng, b\u1ea1n s\u1ebd th\u1ec3 hi\u1ec7n \u0111\u01b0\u1ee3c s\u1ef1 t\u1ef1 tin v\u00e0 b\u1ea3n l\u0129nh c\u1ea7n thi\u1ebft \u0111\u1ec3 th\u00e0nh c\u00f4ng trong cu\u1ed9c ph\u1ecfng v\u1ea5n ti\u1ebfp theo c\u1ee7a m\u00ecnh. Ch\u00fac b\u1ea1n may m\u1eafn trong qu\u00e1 tr\u00ecnh chu\u1ea9n b\u1ecb! \ud83c\udf1f<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tham gia m\u1ed9t bu\u1ed5i ph\u1ecfng v\u1ea5n k\u1ef9 thu\u1eadt cho v\u1ecb tr\u00ed ph\u00e1t tri\u1ec3n c\u01a1 s\u1edf d\u1eef li\u1ec7u \u0111\u00f2i h\u1ecfi h\u01a1n ch\u1ec9 vi\u1ec7c bi\u1ebft c\u00fa ph\u00e1p SQL. B\u1ea1n ph\u1ea3i th\u1ec3 hi\u1ec7n&hellip;<\/p>\n","protected":false},"author":1,"featured_media":1577,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_title":"Chu\u1ea9n b\u1ecb ph\u1ecfng v\u1ea5n Developer C\u01a1 s\u1edf d\u1eef li\u1ec7u: C\u00e2u h\u1ecfi ERD quan tr\u1ecdng \u0111\u01b0\u1ee3c tr\u1ea3 l\u1eddi \ud83d\udcbb","_yoast_wpseo_metadesc":"Chu\u1ea9n b\u1ecb cho cu\u1ed9c ph\u1ecfng v\u1ea5n ti\u1ebfp theo c\u1ee7a b\u1ea1n v\u1edbi c\u00e1c c\u00e2u h\u1ecfi v\u00e0 c\u00e2u tr\u1ea3 l\u1eddi ERD quan tr\u1ecdng. H\u1ecdc c\u00e1ch m\u00f4 h\u00ecnh h\u00f3a d\u1eef li\u1ec7u, chu\u1ea9n h\u00f3a v\u00e0 t\u00ednh b\u1ed9i s\u1ed1 cho c\u00e1c v\u1ecb tr\u00ed c\u01a1 s\u1edf d\u1eef li\u1ec7u.","fifu_image_url":"","fifu_image_alt":"","footnotes":""},"categories":[86],"tags":[82,85],"class_list":["post-1576","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>Chu\u1ea9n b\u1ecb ph\u1ecfng v\u1ea5n Developer C\u01a1 s\u1edf d\u1eef li\u1ec7u: C\u00e2u h\u1ecfi ERD quan tr\u1ecdng \u0111\u01b0\u1ee3c tr\u1ea3 l\u1eddi \ud83d\udcbb<\/title>\n<meta name=\"description\" content=\"Chu\u1ea9n b\u1ecb cho cu\u1ed9c ph\u1ecfng v\u1ea5n ti\u1ebfp theo c\u1ee7a b\u1ea1n v\u1edbi c\u00e1c c\u00e2u h\u1ecfi v\u00e0 c\u00e2u tr\u1ea3 l\u1eddi ERD quan tr\u1ecdng. 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