{"id":11163,"date":"2026-04-15T16:49:26","date_gmt":"2026-04-15T08:49:26","guid":{"rendered":"https:\/\/www.archimetric.com\/vn\/learn-erd-modeling-by-doing-5-real-world-examples-that-taught-me-database-design\/"},"modified":"2026-04-15T16:49:26","modified_gmt":"2026-04-15T08:49:26","slug":"learn-erd-modeling-by-doing-5-real-world-examples-that-taught-me-database-design","status":"publish","type":"post","link":"https:\/\/www.archimetric.com\/vn\/learn-erd-modeling-by-doing-5-real-world-examples-that-taught-me-database-design\/","title":{"rendered":"H\u1ecdc m\u00f4 h\u00ecnh h\u00f3a ERD b\u1eb1ng th\u1ef1c h\u00e0nh: 5 v\u00ed d\u1ee5 th\u1ef1c t\u1ebf \u0111\u00e3 d\u1ea1y t\u00f4i thi\u1ebft k\u1ebf c\u01a1 s\u1edf d\u1eef li\u1ec7u"},"content":{"rendered":"<h2>Ph\u1ea7n gi\u1edbi thi\u1ec7u m\u1edbi: T\u1ea1i sao v\u00ed d\u1ee5 lu\u00f4n v\u01b0\u1ee3t tr\u1ed9i h\u01a1n l\u00fd thuy\u1ebft m\u1ed7i l\u1ea7n<\/h2>\n<p>Khi t\u00f4i l\u1ea7n \u0111\u1ea7u\u5c1d\u8bd5 h\u1ecdc v\u1ebd s\u01a1 \u0111\u1ed3 quan h\u1ec7 th\u1ef1c th\u1ec3, t\u00f4i ch\u00ecm ng\u1eadp trong c\u00e1c s\u00e1ch gi\u00e1o khoa gi\u1ea3i th\u00edch v\u1ec1 t\u00ednh b\u1ed9i s\u1ed1, chu\u1ea9n h\u00f3a v\u00e0 k\u00fd hi\u1ec7u Chen. Kh\u00f4ng \u0111\u1ebfn khi t\u00f4i b\u1eaft \u0111\u1ea7u ph\u00e2n t\u00edch ng\u01b0\u1ee3c c\u00e1c v\u00ed d\u1ee5 th\u1ef1c t\u1ebf, m\u1ecdi th\u1ee9 m\u1edbi tr\u1edf n\u00ean r\u00f5 r\u00e0ng. L\u00e0 m\u1ed9t qu\u1ea3n l\u00fd s\u1ea3n ph\u1ea9m th\u01b0\u1eddng xuy\u00ean ph\u1ed1i h\u1ee3p h\u00e0ng ng\u00e0y v\u1edbi c\u00e1c \u0111\u1ed9i k\u1ef9 thu\u1eadt, t\u1eeb \u0111\u00f3 t\u00f4i \u0111\u00e3 \u00e1p d\u1ee5ng ph\u01b0\u01a1ng ph\u00e1p h\u1ecdc qua v\u00ed d\u1ee5\u2014v\u00e0 \u0111i\u1ec1u \u0111\u00f3 \u0111\u00e3 thay \u0111\u1ed5i ho\u00e0n to\u00e0n c\u00e1ch t\u00f4i x\u00e2y d\u1ef1ng m\u00f4 h\u00ecnh d\u1eef li\u1ec7u th\u1eed nghi\u1ec7m.<\/p>\n<p class=\"\">Trong h\u01b0\u1edbng d\u1eabn th\u1ef1c h\u00e0nh n\u00e0y, t\u00f4i s\u1ebd d\u1eabn b\u1ea1n \u0111i qua n\u0103m v\u00ed d\u1ee5 ERD \u0111\u01b0\u1ee3c ch\u1ecdn l\u1ecdc c\u1ea9n th\u1eadn t\u1eeb C\u00f4ng c\u1ee5 ERD Tr\u1ef1c tuy\u1ebfn c\u1ee7a Visual Paradigm. V\u1edbi m\u1ed7i v\u00ed d\u1ee5, t\u00f4i s\u1ebd chia s\u1ebb nh\u1eefng \u0111i\u1ec1u t\u00f4i \u0111\u00e3 h\u1ecdc \u0111\u01b0\u1ee3c, c\u00e1c kh\u00e1i ni\u1ec7m c\u1ed1t l\u00f5i m\u00e0 ch\u00fang minh h\u1ecda, v\u00e0 nh\u1eefng m\u1eb9o th\u1ef1c t\u1ebf b\u1ea1n c\u00f3 th\u1ec3 \u00e1p d\u1ee5ng ngay l\u1eadp t\u1ee9c. Kh\u00f4ng c\u00f3 s\u1ef1 qu\u00e1 t\u1ea3i thu\u1eadt ng\u1eef\u2014ch\u1ec9 c\u00f3 nh\u1eefng m\u1eabu th\u1ef1c, quy tr\u00ecnh th\u1ef1c v\u00e0 k\u1ebft qu\u1ea3 th\u1ef1c s\u1ef1.<\/p>\n<p class=\"\"><img alt=\"Online ERD Tool\" decoding=\"async\" src=\"https:\/\/online.visual-paradigm.com\/images\/features\/erd-tool\/01-online-erd-tool.png\"\/><\/p>\n<h2>T\u1ed5ng quan nhanh: 4 kh\u00e1i ni\u1ec7m ERD b\u1ea1n th\u1ef1c s\u1ef1 c\u1ea7n<\/h2>\n<p>Tr\u01b0\u1edbc khi b\u1eaft \u0111\u1ea7u, \u0111\u00e2y l\u00e0 nh\u1eefng kh\u00e1i ni\u1ec7m n\u1ec1n t\u1ea3ng m\u00e0 c\u00e1c v\u00ed d\u1ee5 n\u00e0y s\u1ebd c\u1ee7ng c\u1ed1:<\/p>\n<p>\ud83d\udd39\u00a0<strong>C\u00e1c th\u1ef1c th\u1ec3<\/strong>: Nh\u1eefng &#8220;danh t\u1eeb&#8221; trong h\u1ec7 th\u1ed1ng c\u1ee7a b\u1ea1n (v\u00ed d\u1ee5 nh\u01b0\u00a0<code data-backticks=\"1\">Kh\u00e1ch h\u00e0ng<\/code>,\u00a0<code data-backticks=\"1\">\u0110\u01a1n h\u00e0ng<\/code>,\u00a0<code data-backticks=\"1\">S\u1ea3n ph\u1ea9m<\/code>)<br \/>\n\ud83d\udd39\u00a0<strong>Thu\u1ed9c t\u00ednh<\/strong>: Nh\u1eefng thu\u1ed9c t\u00ednh m\u00f4 t\u1ea3 c\u00e1c th\u1ef1c th\u1ec3 (v\u00ed d\u1ee5 nh\u01b0\u00a0<code data-backticks=\"1\">Customer.email<\/code>,\u00a0<code data-backticks=\"1\">Order.date<\/code>)<br \/>\n\ud83d\udd39\u00a0<strong>M\u1ed1i quan h\u1ec7<\/strong>: C\u00e1ch c\u00e1c th\u1ef1c th\u1ec3 k\u1ebft n\u1ed1i v\u1edbi nhau (v\u00ed d\u1ee5 nh\u01b0\u00a0<code data-backticks=\"1\">Kh\u00e1ch h\u00e0ng \u0111\u1eb7t \u0110\u01a1n h\u00e0ng<\/code>)<br \/>\n\ud83d\udd39\u00a0<strong>T\u00ednh b\u1ed9i s\u1ed1<\/strong>: C\u00e1c quy t\u1eafc &#8220;bao nhi\u00eau&#8221; (m\u1ed9t-m\u1ed9t, m\u1ed9t-nhi\u1ec1u, nhi\u1ec1u-nhi\u1ec1u)<\/p>\n<p>Hi\u1ec3u r\u1ed3i ch\u1ee9? Tuy\u1ec7t v\u1eddi. H\u00e3y c\u00f9ng h\u1ecdc b\u1eb1ng c\u00e1ch x\u00e2y d\u1ef1ng.<\/p>\n<hr\/>\n<h2>V\u00ed d\u1ee5 1: S\u01a1 \u0111\u1ed3 ERD Tr\u01b0\u1eddng h\u1ecdc v\u00e0 Sinh vi\u00ean \u0111\u01a1n gi\u1ea3n (L\u00fd t\u01b0\u1edfng cho ng\u01b0\u1eddi m\u1edbi b\u1eaft \u0111\u1ea7u)<\/h2>\n<p><a href=\"https:\/\/online.visual-paradigm.com\/diagrams\/templates\/entity-relationship-diagram\/simple-school-and-student-erd\" title=\"Simple School and Student ERD\"><img alt=\"Simple School and Student ERD (ER Diagram Example)\" decoding=\"async\" src=\"https:\/\/online.visual-paradigm.com\/repository\/images\/aae8b55e-a1c7-4462-9ca8-07020f00ba04.png\"\/><\/a><br \/>\n<a href=\"https:\/\/online.visual-paradigm.com\/diagrams.jsp#diagram:proj=0&amp;type=ERDiagram&amp;gallery=\/repository\/aae8b55e-a1c7-4462-9ca8-07020f00ba04.xml&amp;name=Simple%20School%20and%20Student%20ERD\">S\u01a1 \u0111\u1ed3 ERD Tr\u01b0\u1eddng h\u1ecdc v\u00e0 Sinh vi\u00ean \u0111\u01a1n gi\u1ea3n<\/a><\/p>\n<h3>\u0110i\u1ec1u g\u00ec \u0111\u01b0\u1ee3c d\u1ea1y trong v\u00ed d\u1ee5 n\u00e0y<\/h3>\n<ul>\n<li>\n<p>\u0110\u1ecbnh ngh\u0129a c\u01a1 b\u1ea3n v\u1ec1 th\u1ef1c th\u1ec3 (<code data-backticks=\"1\">Sinh vi\u00ean<\/code>,\u00a0<code data-backticks=\"1\">Tr\u01b0\u1eddng h\u1ecdc<\/code>,\u00a0<code data-backticks=\"1\">Kh\u00f3a h\u1ecdc<\/code>)<\/p>\n<\/li>\n<li>\n<p>M\u1ed1i quan h\u1ec7 m\u1ed9t-\u0111a (m\u1ed9t tr\u01b0\u1eddng h\u1ecdc c\u00f3 nhi\u1ec1u sinh vi\u00ean)<\/p>\n<\/li>\n<li>\n<p>X\u00e1c \u0111\u1ecbnh kh\u00f3a ch\u00ednh (<code data-backticks=\"1\">student_id<\/code>)<\/p>\n<\/li>\n<\/ul>\n<h3>Kho\u1ea3nh kh\u1eafc \u201c\u00c0, ra v\u1eady!\u201d c\u1ee7a t\u00f4i<\/h3>\n<p>T\u00f4i th\u00edch c\u00e1ch v\u00ed d\u1ee5 n\u00e0y gi\u1eef c\u00e1c thu\u1ed9c t\u00ednh \u1edf m\u1ee9c t\u1ed1i thi\u1ec3u. L\u00e0 ng\u01b0\u1eddi m\u1edbi, t\u00f4i t\u1eebng l\u00e0m r\u1ed1i c\u00e1c th\u1ef1c th\u1ec3 b\u1eb1ng m\u1ecdi tr\u01b0\u1eddng kh\u1ea3 d\u0129. \u0110i\u1ec1u n\u00e0y d\u1ea1y t\u00f4i:\u00a0<strong>b\u1eaft \u0111\u1ea7u b\u1eb1ng nh\u1eefng g\u00ec b\u1ea1n c\u1ea7n \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh duy nh\u1ea5t v\u00e0 k\u1ebft n\u1ed1i c\u00e1c th\u1ef1c th\u1ec3<\/strong>. B\u1ea1n lu\u00f4n c\u00f3 th\u1ec3 th\u00eam thu\u1ed9c t\u00ednh sau n\u00e0y.<\/p>\n<h3>M\u1eb9o chuy\u00ean gia cho m\u1eabu n\u00e0y<\/h3>\n<p>\u2705 S\u1eed d\u1ee5ng t\u00ean th\u1ef1c th\u1ec3 \u1edf d\u1ea1ng s\u1ed1 \u00edt (<code data-backticks=\"1\">Sinh vi\u00ean<\/code>\u00a0kh\u00f4ng ph\u1ea3i\u00a0<code data-backticks=\"1\">Sinh vi\u00ean<\/code>) \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o t\u00ednh nh\u1ea5t qu\u00e1n<br \/>\n\u2705 \u0110\u1eb7t kh\u00f3a ch\u00ednh \u1edf \u0111\u1ea7u m\u1ed7i h\u1ed9p th\u1ef1c th\u1ec3 \u0111\u1ec3 d\u1ec5 quan s\u00e1t nhanh<br \/>\n\u2705 Ghi nh\u00e3n r\u00f5 r\u00e0ng c\u00e1c \u0111\u01b0\u1eddng m\u1ed1i quan h\u1ec7 (\u201c\u0111\u0103ng k\u00fd v\u00e0o\u201d, \u201cthu\u1ed9c v\u1ec1\u201d) \u0111\u1ec3 tr\u00e1nh hi\u1ec3u nh\u1ea7m<\/p>\n<hr\/>\n<h2>V\u00ed d\u1ee5 2: V\u00ed d\u1ee5 s\u01a1 \u0111\u1ed3 ERD \u2013 M\u00e1y ATM (Th\u00e0nh th\u1ea1o m\u00f4 h\u00ecnh giao d\u1ecbch)<\/h2>\n<p><a href=\"https:\/\/online.visual-paradigm.com\/diagrams\/templates\/entity-relationship-diagram\/erd-example-atm\" title=\"ERD Example - ATM\"><img alt=\"ERD Example - ATM (ER Diagram Example)\" decoding=\"async\" src=\"https:\/\/online.visual-paradigm.com\/repository\/images\/7eb24322-267a-4239-8e0c-b8339b1cd46e.png\"\/><\/a><br \/>\n<a href=\"https:\/\/online.visual-paradigm.com\/diagrams.jsp#diagram:proj=0&amp;type=ERDiagram&amp;gallery=\/repository\/7eb24322-267a-4239-8e0c-b8339b1cd46e.xml&amp;name=ERD%20Example%20-%20ATM\">V\u00ed d\u1ee5 s\u01a1 \u0111\u1ed3 ERD \u2013 M\u00e1y ATM<\/a><\/p>\n<h3>\u0110i\u1ec1u g\u00ec \u0111\u01b0\u1ee3c d\u1ea1y trong v\u00ed d\u1ee5 n\u00e0y<\/h3>\n<ul>\n<li>\n<p>M\u00f4 h\u00ecnh h\u00f3a c\u00e1c giao d\u1ecbch nh\u1ea1y c\u1ea3m v\u1edbi th\u1eddi gian (<code data-backticks=\"1\">Giao d\u1ecbch<\/code>\u00a0th\u1ef1c th\u1ec3 v\u1edbi th\u1eddi \u0111i\u1ec3m<\/p>\n<\/li>\n<li>\n<p>X\u1eed l\u00fd c\u00e1c m\u1ed1i quan h\u1ec7 t\u00f9y ch\u1ecdn (m\u1ed9t th\u1ebb c\u00f3 th\u1ec3 ch\u01b0a c\u00f3 giao d\u1ecbch n\u00e0o)<\/p>\n<\/li>\n<li>\n<p>T\u00e1ch bi\u1ec7t x\u00e1c th\u1ef1c (<code data-backticks=\"1\">Th\u1ebb<\/code>,\u00a0<code data-backticks=\"1\">M\u00e3 PIN<\/code>) kh\u1ecfi logic kinh doanh (<code data-backticks=\"1\">T\u00e0i kho\u1ea3n<\/code>,\u00a0<code data-backticks=\"1\">Giao d\u1ecbch<\/code>)<\/p>\n<\/li>\n<\/ul>\n<h3>Kho\u1ea3nh kh\u1eafc \u201c\u00c0, ra v\u1eady!\u201d c\u1ee7a t\u00f4i<\/h3>\n<p>V\u00ed d\u1ee5 n\u00e0y \u0111\u00e3 cho t\u00f4i th\u1ea5y c\u00e1ch m\u00f4 h\u00ecnh h\u00f3a\u00a0<strong>s\u1ef1 thay \u0111\u1ed5i tr\u1ea1ng th\u00e1i theo th\u1eddi gian<\/strong>. Thay v\u00ec ch\u1ec9 l\u01b0u tr\u1eef s\u1ed1 d\u01b0, th\u1ef1c th\u1ec3\u00a0<code data-backticks=\"1\">Giao d\u1ecbch<\/code>\u00a0th\u1ef1c th\u1ec3 ghi l\u1ea1i m\u1ecdi h\u00e0nh \u0111\u1ed9ng. M\u1eabu n\u00e0y l\u00e0 v\u00e0ng cho c\u00e1c b\u1ea3n ghi ki\u1ec3m to\u00e1n, b\u00e1o c\u00e1o v\u00e0 g\u1ee1 l\u1ed7i.<\/p>\n<h3>M\u1eb9o chuy\u00ean gia cho m\u1eabu n\u00e0y<\/h3>\n<p>\u2705 Lu\u00f4n bao g\u1ed3m\u00a0<code data-backticks=\"1\">created_at<\/code>\/<code data-backticks=\"1\">updated_at<\/code>\u00a0th\u1eddi \u0111i\u1ec3m tr\u00ean c\u00e1c th\u1ef1c th\u1ec3 giao d\u1ecbch<br \/>\n\u2705 S\u1eed d\u1ee5ng c\u00e1c th\u1ef1c th\u1ec3 y\u1ebfu (h\u1ed9p n\u00e9t \u0111\u1ee9t) cho nh\u1eefng m\u1ee5c kh\u00f4ng th\u1ec3 t\u1ed3n t\u1ea1i \u0111\u1ed9c l\u1eadp (v\u00ed d\u1ee5 nh\u01b0\u00a0<code data-backticks=\"1\">Chi ti\u1ebftGiao d\u1ecbch<\/code>)<br \/>\n\u2705 Ghi ch\u00fa cardinality tr\u1ef1c ti\u1ebfp tr\u00ean c\u00e1c \u0111\u01b0\u1eddng m\u1ed1i quan h\u1ec7:\u00a0<code data-backticks=\"1\">1..*<\/code>\u00a0c\u00f3 ngh\u0129a l\u00e0 \u201cm\u1ed9t ho\u1eb7c nhi\u1ec1u h\u01a1n\u201d<\/p>\n<hr\/>\n<h2>V\u00ed d\u1ee5 3: S\u01a1 \u0111\u1ed3 quan h\u1ec7 th\u1ef1c th\u1ec3: C\u1eeda h\u00e0ng s\u00e1ch tr\u1ef1c tuy\u1ebfn (M\u00f4 h\u00ecnh Th\u01b0\u01a1ng m\u1ea1i \u0111i\u1ec7n t\u1eed)<\/h2>\n<p><a href=\"https:\/\/online.visual-paradigm.com\/diagrams\/templates\/entity-relationship-diagram\/entity-relationship-diagram-online-bookstore\" title=\"Entity Relationship Diagram: Online Bookstore\"><img alt=\"Entity Relationship Diagram: Online Bookstore (ER Diagram Example)\" decoding=\"async\" src=\"https:\/\/online.visual-paradigm.com\/repository\/images\/3e0bd6b5-3c97-473e-a842-e68910b01dea.png\"\/><\/a><br \/>\n<a href=\"https:\/\/online.visual-paradigm.com\/diagrams.jsp#diagram:proj=0&amp;type=ERDiagram&amp;gallery=\/repository\/3e0bd6b5-3c97-473e-a842-e68910b01dea.xml&amp;name=Entity%20Relationship%20Diagram:%20Online%20Bookstore\">S\u01a1 \u0111\u1ed3 quan h\u1ec7 th\u1ef1c th\u1ec3: C\u1eeda h\u00e0ng s\u00e1ch tr\u1ef1c tuy\u1ebfn<\/a><\/p>\n<h3>\u0110i\u1ec1u b\u00e0i v\u00ed d\u1ee5 n\u00e0y d\u1ea1y ch\u00fang ta<\/h3>\n<ul>\n<li>\n<p>C\u00e1c m\u1ed1i quan h\u1ec7 nhi\u1ec1u-\u0111a \u0111\u01b0\u1ee3c gi\u1ea3i quy\u1ebft b\u1eb1ng c\u00e1c b\u1ea3ng li\u00ean k\u1ebft (<code data-backticks=\"1\">OrderItem<\/code>\u00a0k\u1ebft n\u1ed1i\u00a0<code data-backticks=\"1\">Order<\/code>\u00a0v\u00e0\u00a0<code data-backticks=\"1\">Book<\/code>)<\/p>\n<\/li>\n<li>\n<p>Danh m\u1ee5c ph\u00e2n c\u1ea5p (<code data-backticks=\"1\">Category<\/code>\u00a0v\u1edbi m\u1ed1i quan h\u1ec7 t\u1ef1 tham chi\u1ebfu)<\/p>\n<\/li>\n<li>\n<p>M\u00f4 h\u00ecnh n\u1ed9i dung do ng\u01b0\u1eddi d\u00f9ng t\u1ea1o ra (<code data-backticks=\"1\">Review<\/code>,\u00a0<code data-backticks=\"1\">Rating<\/code>\u00a0li\u00ean k\u1ebft v\u1edbi c\u1ea3 hai\u00a0<code data-backticks=\"1\">User<\/code>\u00a0v\u00e0\u00a0<code data-backticks=\"1\">Book<\/code>)<\/p>\n<\/li>\n<\/ul>\n<h3>Kho\u1ea3nh kh\u1eafc \u201c\u00c0, ra v\u1eady!\u201d c\u1ee7a t\u00f4i<\/h3>\n<p>Th\u1ef1c th\u1ec3\u00a0<code data-backticks=\"1\">OrderItem<\/code>\u00a0th\u1ef1c th\u1ec3 \u0111\u00e3 mang l\u1ea1i cho t\u00f4i m\u1ed9t s\u1ef1 th\u1ee9c t\u1ec9nh. Tr\u01b0\u1edbc \u0111\u00e2y t\u00f4i t\u1eebng c\u1ed1 g\u1eafng k\u1ebft n\u1ed1i\u00a0<code data-backticks=\"1\">Order<\/code>\u00a0tr\u1ef1c ti\u1ebfp v\u1edbi\u00a0<code data-backticks=\"1\">Book<\/code>\u00a0v\u1edbi m\u1ed9t \u0111\u01b0\u1eddng n\u1ed1i nhi\u1ec1u-nhi\u1ec1u, nh\u01b0ng v\u00ed d\u1ee5 n\u00e0y cho th\u1ea5y l\u00fd do t\u1ea1i sao m\u1ed9t\u00a0<strong>\u0111\u1ed1i t\u01b0\u1ee3ng giao nhau<\/strong>\u00a0l\u00e0 thi\u1ebft y\u1ebfu: n\u00f3 cho ph\u00e9p b\u1ea1n l\u01b0u tr\u1eef s\u1ed1 l\u01b0\u1ee3ng, gi\u00e1 t\u1ea1i th\u1eddi \u0111i\u1ec3m mua, v\u00e0 c\u00e1c chi ti\u1ebft kh\u00e1c li\u00ean quan \u0111\u1ebfn \u0111\u01a1n h\u00e0ng.<\/p>\n<h3>L\u1eddi khuy\u00ean chuy\u00ean gia cho m\u1eabu n\u00e0y<\/h3>\n<p>\u2705 \u0110\u1eb7t t\u00ean c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng giao nhau r\u00f5 r\u00e0ng (<code data-backticks=\"1\">OrderItem<\/code>, kh\u00f4ng ph\u1ea3i\u00a0<code data-backticks=\"1\">OrderBook<\/code>) \u0111\u1ec3 ph\u1ea3n \u00e1nh m\u1ee5c \u0111\u00edch c\u1ee7a ch\u00fang<br \/>\n\u2705 L\u01b0u tr\u1eef c\u00e1c gi\u00e1 tr\u1ecb l\u1ecbch s\u1eed (nh\u01b0\u00a0<code data-backticks=\"1\">unit_price<\/code>) trong c\u00e1c b\u1ea3ng giao nhau\u2014kh\u00f4ng bao gi\u1edd ph\u1ee5 thu\u1ed9c v\u00e0o d\u1eef li\u1ec7u s\u1ea3n ph\u1ea9m hi\u1ec7n t\u1ea1i<br \/>\n\u2705 S\u1eed d\u1ee5ng m\u1ed1i quan h\u1ec7 \u0111\u1ec7 quy m\u1ed9t c\u00e1ch ti\u1ebft ch\u1ebf; ghi ch\u00fa gi\u1edbi h\u1ea1n \u0111\u1ed9 s\u00e2u c\u1ee7a c\u1ea5u tr\u00fac ph\u00e2n c\u1ea5p<\/p>\n<hr\/>\n<h2>V\u00ed d\u1ee5 4: V\u00ed d\u1ee5 ERD: H\u1ec7 th\u1ed1ng qu\u1ea3n l\u00fd b\u1ec7nh vi\u1ec7n (M\u00f4 h\u00ecnh h\u00f3a th\u1ef1c t\u1ebf ph\u1ee9c t\u1ea1p)<\/h2>\n<p><a href=\"https:\/\/online.visual-paradigm.com\/diagrams\/templates\/entity-relationship-diagram\/erd-example-hospital-management-system\" title=\"ERD Example: Hospital Management System\"><img alt=\"ERD Example: Hospital Management System (ER Diagram Example)\" decoding=\"async\" src=\"https:\/\/online.visual-paradigm.com\/repository\/images\/a5f46368-38e9-4d47-9580-0c4d68c0a629.png\"\/><\/a><br \/>\n<a href=\"https:\/\/online.visual-paradigm.com\/diagrams.jsp#diagram:proj=0&amp;type=ERDiagram&amp;gallery=\/repository\/a5f46368-38e9-4d47-9580-0c4d68c0a629.xml&amp;name=ERD%20Example:%20Hospital%20Management%20System\">V\u00ed d\u1ee5 ERD: H\u1ec7 th\u1ed1ng qu\u1ea3n l\u00fd b\u1ec7nh vi\u1ec7n<\/a><\/p>\n<h3>\u0110i\u1ec1u m\u00e0 v\u00ed d\u1ee5 n\u00e0y d\u1ea1y<\/h3>\n<ul>\n<li>\n<p>M\u00f4 h\u00ecnh h\u00f3a c\u00e1c quy tr\u00ecnh ph\u1ee9c t\u1ea1p (<code data-backticks=\"1\">Appointment<\/code>\u00a0\u2192\u00a0<code data-backticks=\"1\">Diagnosis<\/code>\u00a0\u2192\u00a0<code data-backticks=\"1\">Treatment<\/code>\u00a0\u2192\u00a0<code data-backticks=\"1\">Billing<\/code>)<\/p>\n<\/li>\n<li>\n<p>X\u1eed l\u00fd c\u00e1c m\u1ed1i quan h\u1ec7 d\u1ef1a tr\u00ean vai tr\u00f2 (<code data-backticks=\"1\">Staff<\/code>\u00a0nh\u01b0\u00a0<code data-backticks=\"1\">Doctor<\/code>,\u00a0<code data-backticks=\"1\">Y t\u00e1<\/code>, ho\u1eb7c\u00a0<code data-backticks=\"1\">Qu\u1ea3n tr\u1ecb vi\u00ean<\/code>)<\/p>\n<\/li>\n<li>\n<p>Thi\u1ebft k\u1ebf ch\u00fa \u00fd \u0111\u1ebfn quy\u1ec1n ri\u00eang t\u01b0 (t\u00e1ch bi\u1ec7t\u00a0<code data-backticks=\"1\">B\u1ec7nh nh\u00e2n<\/code>\u00a0d\u1eef li\u1ec7u d\u00e2n s\u1ed1 kh\u1ecfi\u00a0<code data-backticks=\"1\">H\u1ed3 s\u01a1 y t\u1ebf<\/code>)<\/p>\n<\/li>\n<\/ul>\n<h3>Kho\u1ea3nh kh\u1eafc \u201c\u00c0, ra v\u1eady!\u201d c\u1ee7a t\u00f4i<\/h3>\n<p>V\u00ed d\u1ee5 n\u00e0y \u0111\u00e3 d\u1ea1y t\u00f4i\u00a0<strong>m\u00f4 h\u00ecnh h\u00f3a theo m\u00f4-\u0111un<\/strong>. Thay v\u00ec m\u1ed9t th\u1ef1c th\u1ec3 kh\u1ed5ng l\u1ed3\u00a0<code data-backticks=\"1\">B\u1ec7nh nh\u00e2n<\/code>\u00a0v\u1edbi 50 tr\u01b0\u1eddng, c\u00e1c v\u1ea5n \u0111\u1ec1 li\u00ean quan \u0111\u01b0\u1ee3c chia th\u00e0nh\u00a0<code data-backticks=\"1\">B\u1ec7nh nh\u00e2n<\/code>,\u00a0<code data-backticks=\"1\">H\u1ed3 s\u01a1 y t\u1ebf<\/code>,\u00a0<code data-backticks=\"1\">B\u1ea3o hi\u1ec3m<\/code>, v\u00e0\u00a0<code data-backticks=\"1\">Li\u00ean h\u1ec7 kh\u1ea9n c\u1ea5p<\/code>. \u0110i\u1ec1u n\u00e0y gi\u00fap s\u01a1 \u0111\u1ed3 d\u1ec5 \u0111\u1ecdc v\u00e0 c\u01a1 s\u1edf d\u1eef li\u1ec7u d\u1ec5 b\u1ea3o tr\u00ec.<\/p>\n<h3>M\u1eb9o chuy\u00ean gia cho m\u1eabu n\u00e0y<\/h3>\n<p>\u2705 S\u1eed d\u1ee5ng m\u00e3 m\u00e0u ho\u1eb7c khung nh\u00f3m \u0111\u1ec3 tr\u1ef1c quan h\u00f3a c\u00e1c th\u1ef1c th\u1ec3 li\u00ean quan (v\u00ed d\u1ee5: t\u1ea5t c\u1ea3 c\u00e1c th\u1ef1c th\u1ec3 thanh to\u00e1n)<br \/>\n\u2705 Th\u00eam ghi ch\u00fa cho c\u00e1c quy t\u1eafc kinh doanh kh\u00f4ng th\u1ec3 hi\u1ec3n th\u1ecb tr\u1ef1c quan (\u201cM\u1ed9t b\u1ec7nh nh\u00e2n ph\u1ea3i c\u00f3 m\u1ed9t b\u00e1c s\u0129 \u0111i\u1ec1u tr\u1ecb ch\u00ednh\u201d) <br \/>\n\u2705 M\u00f4 h\u00ecnh h\u00f3a y\u00eau c\u1ea7u ki\u1ec3m to\u00e1n t\u1eeb s\u1edbm: ai truy c\u1eadp h\u1ed3 s\u01a1, khi n\u00e0o v\u00e0 v\u00ec sao<\/p>\n<hr\/>\n<h2>V\u00ed d\u1ee5 5: M\u00f4 h\u00ecnh ER: \u0110i\u1ec3m sinh vi\u00ean \u2013 M\u1ed1i quan h\u1ec7 tam ph\u00e2n (Kh\u00e1i ni\u1ec7m n\u00e2ng cao)<\/h2>\n<p><a href=\"https:\/\/online.visual-paradigm.com\/diagrams\/templates\/entity-relationship-diagram\/er-model-student-score-ternary-relationship\" title=\"ER Model: Student Score - Ternary Relationship\"><img alt=\"ER Model: Student Score - Ternary Relationship (ER Diagram Example)\" decoding=\"async\" src=\"https:\/\/online.visual-paradigm.com\/repository\/images\/8c19cb11-48a3-4ebf-a914-08efc3484567.png\"\/><\/a><br \/>\n<a href=\"https:\/\/online.visual-paradigm.com\/diagrams.jsp#diagram:proj=0&amp;type=ERDiagram&amp;gallery=\/repository\/8c19cb11-48a3-4ebf-a914-08efc3484567.xml&amp;name=ER%20Model:%20Student%20Score%20-%20Ternary%20Relationship\">M\u00f4 h\u00ecnh ER: \u0110i\u1ec3m sinh vi\u00ean \u2013 M\u1ed1i quan h\u1ec7 tam ph\u00e2n<\/a><\/p>\n<h3>\u0110i\u1ec1u m\u00e0 v\u00ed d\u1ee5 n\u00e0y d\u1ea1y ch\u00fang ta<\/h3>\n<ul>\n<li>\n<p>M\u1ed1i quan h\u1ec7 ba ng\u00f4i: khi ba th\u1ef1c th\u1ec3 giao nhau m\u1ed9t c\u00e1ch c\u00f3 \u00fd ngh\u0129a (<code data-backticks=\"1\">Sinh vi\u00ean<\/code>\u00a0+\u00a0<code data-backticks=\"1\">M\u00f4n h\u1ecdc<\/code>\u00a0+\u00a0<code data-backticks=\"1\">H\u1ecdc k\u1ef3<\/code>\u00a0\u2192\u00a0<code data-backticks=\"1\">\u0110i\u1ec3m<\/code>)<\/p>\n<\/li>\n<li>\n<p>Khi n\u00e0o n\u00ean thay th\u1ebf m\u1ed1i quan h\u1ec7 ba ng\u00f4i b\u1eb1ng m\u1ed9t th\u1ef1c th\u1ec3 li\u00ean k\u1ebft \u0111\u1ec3 r\u00f5 r\u00e0ng h\u01a1n<\/p>\n<\/li>\n<li>\n<p>M\u00f4 h\u00ecnh h\u00f3a c\u00e1c m\u1ed1i quan h\u1ec7 c\u00f3 th\u1eddi h\u1ea1n (\u0111i\u1ec3m c\u1ee7a m\u1ed9t sinh vi\u00ean trong m\u1ed9t m\u00f4n h\u1ecdc ph\u1ee5 thu\u1ed9c v\u00e0o h\u1ecdc k\u1ef3)<\/p>\n<\/li>\n<\/ul>\n<h3>Kho\u1ea3nh kh\u1eafc \u201c\u00c0, ra v\u1eady!\u201d c\u1ee7a t\u00f4i<\/h3>\n<p>Tr\u01b0\u1edbc \u0111\u00e2y t\u00f4i lu\u00f4n \u00e9p c\u00e1c m\u1ed1i quan h\u1ec7 ba ng\u00f4i th\u00e0nh nhi\u1ec1u m\u1ed1i quan h\u1ec7 nh\u1ecb ph\u00e2n v\u00e0 \u0111\u00e1nh m\u1ea5t b\u1ed1i c\u1ea3nh quan tr\u1ecdng. V\u00ed d\u1ee5 n\u00e0y \u0111\u00e3 cho th\u1ea5y r\u1eb1ng<strong>\u0111\u00f4i khi m\u1ed9t m\u1ed1i quan h\u1ec7 ba ph\u00eda l\u00e0 c\u00e1ch bi\u1ec3u di\u1ec5n trung th\u1ef1c nh\u1ea5t<\/strong>\u2014nh\u01b0ng th\u01b0\u1eddng th\u00ec, chuy\u1ec3n \u0111\u1ed5i n\u00f3 th\u00e0nh m\u1ed9t th\u1ef1c th\u1ec3 li\u00ean k\u1ebft (<code data-backticks=\"1\">\u0110\u0103ng k\u00fd<\/code>) v\u1edbi c\u00e1c thu\u1ed9c t\u00ednh (<code data-backticks=\"1\">\u0111i\u1ec3m<\/code>,\u00a0<code data-backticks=\"1\">s\u1ed1 bu\u1ed5i tham gia<\/code>) s\u1ebd th\u1ef1c t\u1ebf h\u01a1n khi tri\u1ec3n khai.<\/p>\n<h3>M\u1eb9o chuy\u00ean gia cho m\u1eabu n\u00e0y<\/h3>\n<p>\u2705 H\u1ecfi: \u201cM\u1ed1i quan h\u1ec7 n\u00e0y c\u00f3 th\u1ec3 c\u00f3 c\u00e1c thu\u1ed9c t\u00ednh ri\u00eang kh\u00f4ng?\u201d N\u1ebfu c\u00f3, h\u00e3y s\u1eed d\u1ee5ng m\u1ed9t th\u1ef1c th\u1ec3 li\u00ean k\u1ebft<br \/>\n\u2705 Ghi ch\u00fa quy t\u1eafc kinh doanh y\u00eau c\u1ea7u m\u1ed1i quan h\u1ec7 ba ng\u00f4i trong ch\u00fa th\u00edch s\u01a1 \u0111\u1ed3<br \/>\n\u2705 Trong tri\u1ec3n khai, th\u1ef1c th\u1ec3 li\u00ean k\u1ebft th\u01b0\u1eddng tr\u1edf th\u00e0nh m\u1ed9t b\u1ea3ng v\u1edbi ba kh\u00f3a ngo\u1ea1i<\/p>\n<hr\/>\n<h2>5 m\u1eb9o v\u00e0 th\u1ee7 thu\u1eadt ERD h\u00e0ng \u0111\u1ea7u c\u1ee7a t\u00f4i (v\u1eeba h\u1ecdc \u0111\u01b0\u1ee3c qua th\u1eed th\u00e1ch)<\/h2>\n<p>Sau khi l\u00e0m qua h\u00e0ng ch\u1ee5c v\u00ed d\u1ee5, \u0111\u00e2y l\u00e0 nh\u1eefng th\u00f3i quen gi\u00fap t\u00f4i ti\u1ebft ki\u1ec7m h\u00e0ng gi\u1edd:<\/p>\n<ol>\n<li>\n<p><strong>B\u1eaft \u0111\u1ea7u \u1edf c\u1ea5p \u0111\u1ed9 kh\u00e1i ni\u1ec7m, sau \u0111\u00f3 tinh ch\u1ec9nh<\/strong><br \/>\nV\u1ebd ph\u00e1c c\u00e1c th\u1ef1c th\u1ec3 v\u00e0 m\u1ed1i quan h\u1ec7 tr\u00ean gi\u1ea5y tr\u01b0\u1edbc. \u0110\u1eebng b\u1ecb m\u1eafc k\u1eb9t v\u00e0o chi ti\u1ebft thu\u1ed9c t\u00ednh cho \u0111\u1ebfn khi c\u1ea5u tr\u00fac c\u1ea3m gi\u00e1c \u0111\u00fang \u0111\u1eafn.<\/p>\n<\/li>\n<li>\n<p><strong>\u0110\u1eb7t t\u00ean c\u00e1c m\u1ed1i quan h\u1ec7 b\u1eb1ng \u0111\u1ed9ng t\u1eeb<\/strong><br \/>\n<code data-backticks=\"1\">Kh\u00e1ch h\u00e0ng \u0111\u1eb7t h\u00e0ng<\/code>\u00a0r\u00f5 r\u00e0ng h\u01a1n ch\u1ec9 l\u00e0 m\u1ed9t \u0111\u01b0\u1eddng th\u1eb3ng. Future-you (v\u00e0 \u0111\u1ed3ng \u0111\u1ed9i c\u1ee7a b\u1ea1n) s\u1ebd c\u1ea3m \u01a1n b\u1ea1n.<\/p>\n<\/li>\n<li>\n<p><strong>S\u1eed d\u1ee5ng th\u01b0 vi\u1ec7n v\u00ed d\u1ee5 nh\u01b0 b\u1ea3ng ghi nh\u1edb<\/strong><br \/>\nTh\u01b0 vi\u1ec7n m\u1eabu c\u1ee7a Visual Paradigm kh\u00f4ng ch\u1ec9 mang t\u00ednh c\u1ea3m h\u1ee9ng\u2014n\u00f3 l\u00e0 m\u1ed9t th\u01b0 vi\u1ec7n m\u1eabu. Sao ch\u00e9p m\u1ed9t v\u00ed d\u1ee5 t\u01b0\u01a1ng t\u1ef1 v\u00e0 \u0111i\u1ec1u ch\u1ec9nh n\u00f3.<\/p>\n<\/li>\n<li>\n<p><strong>X\u00e1c minh t\u00ednh cardinality v\u1edbi c\u00e1c t\u00ecnh hu\u1ed1ng th\u1ef1c t\u1ebf<\/strong><br \/>\nH\u1ecfi: \u201cLi\u1ec7u \u0111i\u1ec1u n\u00e0y c\u00f3 th\u1ec3 x\u1ea3y ra kh\u00f4ng?\u201d (v\u00ed d\u1ee5: \u201cM\u1ed9t \u0111\u01a1n h\u00e0ng c\u00f3 th\u1ec3 t\u1ed3n t\u1ea1i m\u00e0 kh\u00f4ng c\u00f3 kh\u00e1ch h\u00e0ng kh\u00f4ng?\u201d N\u1ebfu c\u00f3, h\u00e3y \u0111i\u1ec1u ch\u1ec9nh cardinality).<\/p>\n<\/li>\n<li>\n<p><strong>Th\u00eam m\u1ed9t th\u1ef1c th\u1ec3 \u201cCh\u00fa th\u00edch\u201d ho\u1eb7c \u201cGhi ch\u00fa\u201d<\/strong><br \/>\n\u0110\u1ed1i v\u1edbi c\u00e1c s\u01a1 \u0111\u1ed3 ph\u1ee9c t\u1ea1p, h\u00e3y th\u00eam m\u1ed9t h\u1ed9p ghi ch\u00fa tr\u00f4i n\u1ed5i \u0111\u1ec3 gi\u1ea3i th\u00edch c\u00e1c gi\u1ea3 \u0111\u1ecbnh, quy t\u1eafc kinh doanh ho\u1eb7c th\u00f4ng tin phi\u00ean b\u1ea3n.<\/p>\n<\/li>\n<\/ol>\n<p><img alt=\"\" decoding=\"async\" src=\"https:\/\/www.archimetric.com\/wp-content\/uploads\/2026\/04\/img_69df51175f0b3.\"\/><\/p>\n<h1>S\u01a1 \u0111\u1ed3 ERD kh\u00e1i ni\u1ec7m<\/h1>\n<p>Thi\u1ebft k\u1ebf b\u1edfi\u00a0<a href=\"https:\/\/online.visual-paradigm.com\/community\/user\/gugu%20dev\">@Gugu Dev<\/a><\/p>\n<hr\/>\n<h2>K\u1ebft lu\u1eadn m\u1edbi: L\u1ea7n l\u01b0\u1ee3t c\u1ee7a b\u1ea1n \u0111\u1ec3 h\u1ecdc b\u1eb1ng th\u1ef1c h\u00e0nh<\/h2>\n<p>Thi\u1ebft k\u1ebf c\u01a1 s\u1edf d\u1eef li\u1ec7u kh\u00f4ng nh\u1ea5t thi\u1ebft ph\u1ea3i \u0111\u00e1ng s\u1ee3. B\u1eb1ng c\u00e1ch nghi\u00ean c\u1ee9u c\u00e1c v\u00ed d\u1ee5 th\u1ef1c t\u1ebf\u2014nh\u01b0 n\u0103m v\u00ed d\u1ee5 m\u00e0 ch\u00fang ta \u0111\u00e3 kh\u00e1m ph\u00e1\u2014b\u1ea1n s\u1ebd ghi nh\u1edb c\u00e1c m\u1eabu m\u00e0 s\u00e1ch gi\u00e1o khoa kh\u00f4ng th\u1ec3 truy\u1ec1n \u0111\u1ea1t. B\u1eaft \u0111\u1ea7u v\u1edbi s\u01a1 \u0111\u1ed3 ERD Tr\u01b0\u1eddng h\u1ecdc \u0111\u01a1n gi\u1ea3n \u0111\u1ec3 x\u00e2y d\u1ef1ng s\u1ef1 t\u1ef1 tin, sau \u0111\u00f3 l\u1ea7n l\u01b0\u1ee3t gi\u1ea3i quy\u1ebft c\u00e1c m\u00f4 h\u00ecnh ph\u1ee9c t\u1ea1p h\u01a1n nh\u01b0 H\u1ec7 th\u1ed1ng B\u1ec7nh vi\u1ec7n ho\u1eb7c c\u00e1c v\u00ed d\u1ee5 v\u1ec1 m\u1ed1i quan h\u1ec7 tam ph\u00e2n.<\/p>\n<p>L\u1eddi khuy\u00ean c\u1ee7a t\u00f4i l\u00e0 g\u00ec? M\u1edf C\u00f4ng c\u1ee5 ERD Tr\u1ef1c tuy\u1ebfn c\u1ee7a Visual Paradigm, sao ch\u00e9p m\u1ed9t trong nh\u1eefng v\u00ed d\u1ee5 n\u00e0y, v\u00e0 thay \u0111\u1ed5i m\u1ed9t \u0111i\u1ec1u g\u00ec \u0111\u00f3. Th\u00eam m\u1ed9t thu\u1ed9c t\u00ednh. S\u1eeda \u0111\u1ed5i m\u1ed9t m\u1ed1i quan h\u1ec7. L\u00e0m h\u1ecfng n\u00f3, r\u1ed3i s\u1eeda l\u1ea1i. Ch\u00ednh qu\u00e1 tr\u00ecnh th\u1ef1c h\u00e0nh n\u00e0y m\u1edbi l\u00e0 n\u01a1i th\u1ef1c s\u1ef1 chinh ph\u1ee5c \u0111\u01b0\u1ee3c k\u1ef9 n\u0103ng.<\/p>\n<p>Nh\u1eefng nh\u00e0 thi\u1ebft k\u1ebf ERD xu\u1ea5t s\u1eafc nh\u1ea5t kh\u00f4ng ph\u1ea3i l\u00e0 nh\u1eefng ng\u01b0\u1eddi thu\u1ed9c l\u00f2ng k\u00fd hi\u1ec7u\u2014h\u1ecd l\u00e0 nh\u1eefng ng\u01b0\u1eddi \u0111\u00e3 ph\u00e2n t\u00edch ng\u01b0\u1ee3c \u0111\u1ee7 h\u1ec7 th\u1ed1ng th\u1ef1c t\u1ebf \u0111\u1ec3 nh\u1eadn di\u1ec7n c\u00e1c m\u1eabu m\u1ed9t c\u00e1ch tr\u1ef1c gi\u00e1c. H\u00e0nh tr\u00ecnh c\u1ee7a b\u1ea1n b\u1eaft \u0111\u1ea7u t\u1eeb m\u1ed9t v\u00ed d\u1ee5 duy nh\u1ea5t. B\u1ea1n s\u1ebd th\u1eed v\u00ed d\u1ee5 n\u00e0o \u0111\u1ea7u ti\u00ean?<\/p>\n<hr\/>\n<h2>Danh s\u00e1ch tham kh\u1ea3o<\/h2>\n<ol>\n<li>\n<p><strong><a href=\"https:\/\/online.visual-paradigm.com\/diagrams\/features\/erd-tool\/\">C\u00f4ng c\u1ee5 ERD Tr\u1ef1c tuy\u1ebfn c\u1ee7a Visual Paradigm<\/a><\/strong>: N\u1ec1n t\u1ea3ng tr\u1ef1c tuy\u1ebfn to\u00e0n di\u1ec7n \u0111\u1ec3 t\u1ea1o s\u01a1 \u0111\u1ed3 ERD kh\u00e1i ni\u1ec7m, logic v\u00e0 v\u1eadt l\u00fd v\u1edbi s\u1ef1 \u0111\u01a1n gi\u1ea3n khi k\u00e9o v\u00e0 th\u1ea3.<\/p>\n<\/li>\n<li>\n<p><strong><a href=\"https:\/\/online.visual-paradigm.com\/diagrams\/templates\/entity-relationship-diagram\/simple-school-and-student-erd\">S\u01a1 \u0111\u1ed3 ERD Tr\u01b0\u1eddng h\u1ecdc v\u00e0 H\u1ecdc sinh \u0111\u01a1n gi\u1ea3n<\/a><\/strong>: V\u00ed d\u1ee5 th\u00e2n thi\u1ec7n v\u1edbi ng\u01b0\u1eddi m\u1edbi, minh h\u1ecda c\u00e1c th\u1ef1c th\u1ec3 c\u01a1 b\u1ea3n, thu\u1ed9c t\u00ednh v\u00e0 m\u1ed1i quan h\u1ec7 m\u1ed9t-nhi\u1ec1u trong b\u1ed1i c\u1ea3nh gi\u00e1o d\u1ee5c.<\/p>\n<\/li>\n<li>\n<p><strong><a href=\"https:\/\/online.visual-paradigm.com\/diagrams\/templates\/entity-relationship-diagram\/erd-example-atm\">V\u00ed d\u1ee5 ERD \u2013 M\u00e1y ATM<\/a><\/strong>: M\u00f4 h\u00ecnh h\u1ec7 th\u1ed1ng giao d\u1ecbch minh h\u1ecda c\u00e1c th\u1ef1c th\u1ec3 ph\u1ee5 thu\u1ed9c th\u1eddi gian, m\u1ed1i quan h\u1ec7 t\u00f9y ch\u1ecdn v\u00e0 c\u00e1c m\u1eabu x\u00e1c th\u1ef1c.<\/p>\n<\/li>\n<li>\n<p><strong><a href=\"https:\/\/online.visual-paradigm.com\/diagrams\/templates\/entity-relationship-diagram\/entity-relationship-diagram-online-bookstore\">S\u01a1 \u0111\u1ed3 quan h\u1ec7 th\u1ef1c th\u1ec3: C\u1eeda h\u00e0ng s\u00e1ch tr\u1ef1c tuy\u1ebfn<\/a><\/strong>: Tham kh\u1ea3o th\u01b0\u01a1ng m\u1ea1i \u0111i\u1ec7n t\u1eed v\u1edbi vi\u1ec7c gi\u1ea3i quy\u1ebft m\u1ed1i quan h\u1ec7 nhi\u1ec1u-nhi\u1ec1u th\u00f4ng qua b\u1ea3ng li\u00ean k\u1ebft, danh m\u1ee5c ph\u00e2n c\u1ea5p v\u00e0 m\u00f4 h\u00ecnh h\u00f3a n\u1ed9i dung do ng\u01b0\u1eddi d\u00f9ng t\u1ea1o ra.<\/p>\n<\/li>\n<li>\n<p><strong><a href=\"https:\/\/online.visual-paradigm.com\/diagrams\/templates\/entity-relationship-diagram\/erd-example-hospital-management-system\">V\u00ed d\u1ee5 ERD: H\u1ec7 th\u1ed1ng qu\u1ea3n l\u00fd b\u1ec7nh vi\u1ec7n<\/a><\/strong>: V\u00ed d\u1ee5 v\u1ec1 quy tr\u00ecnh th\u1ef1c t\u1ebf ph\u1ee9c t\u1ea1p minh h\u1ecda thi\u1ebft k\u1ebf theo m\u00f4-\u0111un, m\u1ed1i quan h\u1ec7 d\u1ef1a tr\u00ean vai tr\u00f2 v\u00e0 t\u00e1ch bi\u1ec7t d\u1eef li\u1ec7u nh\u1ea1y c\u1ea3m v\u1ec1 quy\u1ec1n ri\u00eang t\u01b0.<\/p>\n<\/li>\n<li>\n<p class=\"\"><strong><a href=\"https:\/\/online.visual-paradigm.com\/diagrams\/templates\/entity-relationship-diagram\/er-model-student-score-ternary-relationship\">M\u00f4 h\u00ecnh ER: \u0110i\u1ec3m sinh vi\u00ean \u2013 M\u1ed1i quan h\u1ec7 tam ph\u00e2n<\/a><\/strong>: V\u00ed d\u1ee5 m\u00f4 h\u00ecnh h\u00f3a n\u00e2ng cao minh h\u1ecda khi n\u00e0o v\u00e0 c\u00e1ch n\u00e0o \u0111\u1ec3 bi\u1ec3u di\u1ec5n hi\u1ec7u qu\u1ea3 m\u1ed1i quan h\u1ec7 ba th\u1ef1c th\u1ec3.<\/p>\n<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"<p>Ph\u1ea7n gi\u1edbi thi\u1ec7u m\u1edbi: T\u1ea1i sao v\u00ed d\u1ee5 lu\u00f4n v\u01b0\u1ee3t tr\u1ed9i h\u01a1n l\u00fd thuy\u1ebft m\u1ed7i l\u1ea7n Khi t\u00f4i l\u1ea7n \u0111\u1ea7u\u5c1d\u8bd5<\/p>\n","protected":false},"author":3482,"featured_media":11164,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_title":"","_yoast_wpseo_metadesc":"","fifu_image_url":"https:\/\/online.visual-paradigm.com\/repository\/images\/3e0bd6b5-3c97-473e-a842-e68910b01dea.png","fifu_image_alt":"","footnotes":""},"categories":[149],"tags":[],"class_list":["post-11163","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-database-design"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.0 - 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