{"id":74,"date":"2025-08-16T11:16:02","date_gmt":"2025-08-16T04:16:02","guid":{"rendered":"https:\/\/solio.online\/blog\/?p=74"},"modified":"2025-11-20T14:41:04","modified_gmt":"2025-11-20T07:41:04","slug":"sql-co-ban-va-nang-cao-huong-dan-toan-dien","status":"publish","type":"post","link":"https:\/\/solio.online\/blog\/sql-co-ban-va-nang-cao-huong-dan-toan-dien\/","title":{"rendered":"SQL C\u01a1 B\u1ea3n v\u00e0 N\u00e2ng Cao \u2013 H\u01b0\u1edbng D\u1eabn To\u00e0n Di\u1ec7n"},"content":{"rendered":"\n

1. Gi\u1edbi thi\u1ec7u v\u1ec1 SQL<\/strong><\/p>\n\n\n\n

SQL<\/strong> (Structured Query Language) l\u00e0 ng\u00f4n ng\u1eef truy v\u1ea5n c\u00f3 c\u1ea5u tr\u00fac, \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 t\u01b0\u01a1ng t\u00e1c v\u1edbi h\u1ec7 qu\u1ea3n tr\u1ecb c\u01a1 s\u1edf d\u1eef li\u1ec7u quan h\u1ec7<\/strong> (RDBMS) nh\u01b0 MySQL, PostgreSQL, SQL Server, Oracle, SQLite,\u2026<\/p>\n\n\n\n

SQL cho ph\u00e9p:<\/p>\n\n\n\n

\u2022 T\u1ea1o v\u00e0 qu\u1ea3n l\u00fd c\u01a1 s\u1edf d\u1eef li\u1ec7u<\/p>\n\n\n\n

\u2022 Th\u00eam, s\u1eeda, x\u00f3a d\u1eef li\u1ec7u<\/p>\n\n\n\n

\u2022 Truy v\u1ea5n, l\u1ecdc v\u00e0 ph\u00e2n t\u00edch d\u1eef li\u1ec7u<\/p>\n\n\n\n

\u2022 Ph\u00e2n quy\u1ec1n ng\u01b0\u1eddi d\u00f9ng v\u00e0 b\u1ea3o m\u1eadt d\u1eef li\u1ec7u<\/p>\n\n\n\n

\u2e3b<\/p>\n\n\n\n

2. SQL C\u01a1 B\u1ea3n<\/strong><\/p>\n\n\n\n

2.1. C\u00e1c l\u1ec7nh ch\u00ednh trong SQL<\/strong><\/p>\n\n\n\n

SQL c\u01a1 b\u1ea3n th\u01b0\u1eddng xoay quanh nh\u00f3m l\u1ec7nh:<\/p>\n\n\n\n

1. DDL<\/strong> (Data Definition Language \u2013 Ng\u00f4n ng\u1eef \u0111\u1ecbnh ngh\u0129a d\u1eef li\u1ec7u)<\/p>\n\n\n\n

\u2022 CREATE \u2013 T\u1ea1o m\u1edbi b\u1ea3ng, c\u01a1 s\u1edf d\u1eef li\u1ec7u<\/p>\n\n\n\n

\u2022 ALTER \u2013 Thay \u0111\u1ed5i c\u1ea5u tr\u00fac b\u1ea3ng<\/p>\n\n\n\n

\u2022 DROP \u2013 X\u00f3a b\u1ea3ng ho\u1eb7c c\u01a1 s\u1edf d\u1eef li\u1ec7u<\/p>\n\n\n\n

2. DML<\/strong> (Data Manipulation Language \u2013 Ng\u00f4n ng\u1eef thao t\u00e1c d\u1eef li\u1ec7u)<\/p>\n\n\n\n

\u2022 INSERT \u2013 Th\u00eam d\u1eef li\u1ec7u<\/p>\n\n\n\n

\u2022 UPDATE \u2013 S\u1eeda d\u1eef li\u1ec7u<\/p>\n\n\n\n

\u2022 DELETE \u2013 X\u00f3a d\u1eef li\u1ec7u<\/p>\n\n\n\n

3. DQL<\/strong> (Data Query Language \u2013 Ng\u00f4n ng\u1eef truy v\u1ea5n d\u1eef li\u1ec7u)<\/p>\n\n\n\n

\u2022 SELECT \u2013 L\u1ea5y d\u1eef li\u1ec7u<\/p>\n\n\n\n

4. DCL<\/strong> (Data Control Language \u2013 Ng\u00f4n ng\u1eef \u0111i\u1ec1u khi\u1ec3n d\u1eef li\u1ec7u)<\/p>\n\n\n\n

\u2022 GRANT \u2013 C\u1ea5p quy\u1ec1n<\/p>\n\n\n\n

\u2022 REVOKE \u2013 Thu h\u1ed3i quy\u1ec1n<\/p>\n\n\n\n

\u2e3b<\/p>\n\n\n\n

2.2. C\u00fa ph\u00e1p c\u01a1 b\u1ea3n<\/strong><\/p>\n\n\n\n

T\u1ea1o b\u1ea3ng:<\/strong><\/p>\n\n\n\n

CREATE TABLE users (<\/p>\n\n\n\n

    id INT PRIMARY KEY AUTO_INCREMENT,<\/p>\n\n\n\n

    name VARCHAR(100),<\/p>\n\n\n\n

    email VARCHAR(100) UNIQUE,<\/p>\n\n\n\n

    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP<\/p>\n\n\n\n

);<\/p>\n\n\n\n

Th\u00eam d\u1eef li\u1ec7u:<\/strong><\/p>\n\n\n\n

INSERT INTO users (name, email)<\/p>\n\n\n\n

VALUES (‘Trung Vu’, ‘trung@example.com’);<\/p>\n\n\n\n

Truy v\u1ea5n d\u1eef li\u1ec7u:<\/strong><\/p>\n\n\n\n

SELECT name, email FROM users;<\/p>\n\n\n\n

C\u1eadp nh\u1eadt d\u1eef li\u1ec7u:<\/strong><\/p>\n\n\n\n

UPDATE users<\/p>\n\n\n\n

SET name = ‘Trung Nguy\u1ec5n’<\/p>\n\n\n\n

WHERE id = 1;<\/p>\n\n\n\n

X\u00f3a d\u1eef li\u1ec7u:<\/strong><\/p>\n\n\n\n

DELETE FROM users WHERE id = 1;<\/p>\n\n\n\n

\u2e3b<\/p>\n\n\n\n

2.3. C\u00e1c to\u00e1n t\u1eed v\u00e0 \u0111i\u1ec1u ki\u1ec7n c\u01a1 b\u1ea3n<\/strong><\/p>\n\n\n\n

\u2022 =, <> (kh\u00e1c), <, >, <=, >=<\/p>\n\n\n\n

\u2022 BETWEEN \u2026 AND \u2026<\/p>\n\n\n\n

\u2022 IN (danh s\u00e1ch gi\u00e1 tr\u1ecb)<\/p>\n\n\n\n

\u2022 LIKE (t\u00ecm ki\u1ebfm theo m\u1eabu, d\u00f9ng % ho\u1eb7c _)<\/p>\n\n\n\n

\u2022 IS NULL \/ IS NOT NULL<\/p>\n\n\n\n

V\u00ed d\u1ee5:<\/p>\n\n\n\n

SELECT * FROM users<\/p>\n\n\n\n

WHERE email LIKE ‘%gmail.com’;<\/p>\n\n\n\n

\u2e3b<\/p>\n\n\n\n

2.4. S\u1eafp x\u1ebfp v\u00e0 gi\u1edbi h\u1ea1n k\u1ebft qu\u1ea3<\/strong><\/p>\n\n\n\n

SELECT * FROM users<\/p>\n\n\n\n

ORDER BY created_at DESC<\/p>\n\n\n\n

LIMIT 10;<\/p>\n\n\n\n

\u2e3b<\/p>\n\n\n\n

3. SQL N\u00e2ng Cao<\/strong><\/p>\n\n\n\n

3.1. JOIN \u2013 K\u1ebft h\u1ee3p b\u1ea3ng<\/strong><\/p>\n\n\n\n

JOIN d\u00f9ng \u0111\u1ec3 l\u1ea5y d\u1eef li\u1ec7u t\u1eeb nhi\u1ec1u b\u1ea3ng d\u1ef1a tr\u00ean m\u1ed1i quan h\u1ec7 gi\u1eefa ch\u00fang.<\/p>\n\n\n\n

\u2022 INNER JOIN<\/strong>: Ch\u1ec9 l\u1ea5y d\u1eef li\u1ec7u khi c\u00f3 gi\u00e1 tr\u1ecb kh\u1edbp \u1edf c\u1ea3 hai b\u1ea3ng.<\/p>\n\n\n\n

\u2022 LEFT JOIN<\/strong>: L\u1ea5y t\u1ea5t c\u1ea3 d\u1eef li\u1ec7u t\u1eeb b\u1ea3ng b\u00ean tr\u00e1i, b\u1ea3ng b\u00ean ph\u1ea3i ch\u1ec9 l\u1ea5y khi kh\u1edbp.<\/p>\n\n\n\n

\u2022 RIGHT JOIN<\/strong>: Ng\u01b0\u1ee3c l\u1ea1i v\u1edbi LEFT JOIN.<\/p>\n\n\n\n

\u2022 FULL JOIN<\/strong>: L\u1ea5y t\u1ea5t c\u1ea3 d\u1eef li\u1ec7u t\u1eeb c\u1ea3 hai b\u1ea3ng (m\u1ed9t s\u1ed1 h\u1ec7 CSDL kh\u00f4ng h\u1ed7 tr\u1ee3 tr\u1ef1c ti\u1ebfp, nh\u01b0 MySQL).<\/p>\n\n\n\n

V\u00ed d\u1ee5:<\/p>\n\n\n\n

SELECT orders.id, users.name, orders.total<\/p>\n\n\n\n

FROM orders<\/p>\n\n\n\n

INNER JOIN users ON orders.user_id = users.id;<\/p>\n\n\n\n

\u2e3b<\/p>\n\n\n\n

3.2. Nh\u00f3m v\u00e0 t\u1ed5ng h\u1ee3p d\u1eef li\u1ec7u<\/strong><\/p>\n\n\n\n

D\u00f9ng GROUP BY k\u1ebft h\u1ee3p v\u1edbi c\u00e1c h\u00e0m:<\/p>\n\n\n\n

\u2022 COUNT() \u2013 \u0110\u1ebfm s\u1ed1 d\u00f2ng<\/p>\n\n\n\n

\u2022 SUM() \u2013 T\u00ednh t\u1ed5ng<\/p>\n\n\n\n

\u2022 AVG() \u2013 T\u00ednh trung b\u00ecnh<\/p>\n\n\n\n

\u2022 MIN(), MAX() \u2013 Gi\u00e1 tr\u1ecb nh\u1ecf nh\u1ea5t\/l\u1edbn nh\u1ea5t<\/p>\n\n\n\n

V\u00ed d\u1ee5:<\/p>\n\n\n\n

SELECT user_id, COUNT(*) AS total_orders, SUM(total) AS total_amount<\/p>\n\n\n\n

FROM orders<\/p>\n\n\n\n

GROUP BY user_id<\/p>\n\n\n\n

HAVING total_orders > 5;<\/p>\n\n\n\n

\u2e3b<\/p>\n\n\n\n

3.3. Subquery \u2013 Truy v\u1ea5n l\u1ed3ng<\/strong><\/p>\n\n\n\n

SELECT name, email<\/p>\n\n\n\n

FROM users<\/p>\n\n\n\n

WHERE id IN (<\/p>\n\n\n\n

    SELECT user_id FROM orders WHERE total > 1000000<\/p>\n\n\n\n

);<\/p>\n\n\n\n

\u2e3b<\/p>\n\n\n\n

3.4. Index \u2013 Ch\u1ec9 m\u1ee5c<\/strong><\/p>\n\n\n\n

Index gi\u00fap t\u0103ng t\u1ed1c truy v\u1ea5n nh\u01b0ng ti\u00eau t\u1ed1n b\u1ed9 nh\u1edb.<\/p>\n\n\n\n

CREATE INDEX idx_email ON users(email);<\/p>\n\n\n\n

\u2e3b<\/p>\n\n\n\n

3.5. View \u2013 B\u1ea3ng \u1ea3o<\/strong><\/p>\n\n\n\n

CREATE VIEW top_customers AS<\/p>\n\n\n\n

SELECT user_id, SUM(total) AS total_amount<\/p>\n\n\n\n

FROM orders<\/p>\n\n\n\n

GROUP BY user_id<\/p>\n\n\n\n

ORDER BY total_amount DESC;<\/p>\n\n\n\n

\u2e3b<\/p>\n\n\n\n

3.6. Transaction \u2013 Giao d\u1ecbch<\/strong><\/p>\n\n\n\n

Giao d\u1ecbch \u0111\u1ea3m b\u1ea3o t\u00ednh to\u00e0n v\u1eb9n d\u1eef li\u1ec7u, c\u00f3 th\u1ec3 COMMIT<\/strong> ho\u1eb7c ROLLBACK<\/strong>.<\/p>\n\n\n\n

START TRANSACTION;<\/p>\n\n\n\n

UPDATE accounts SET balance = balance – 500 WHERE id = 1;<\/p>\n\n\n\n

UPDATE accounts SET balance = balance + 500 WHERE id = 2;<\/p>\n\n\n\n

COMMIT;<\/p>\n\n\n\n

— N\u1ebfu c\u00f3 l\u1ed7i: ROLLBACK;<\/p>\n\n\n\n

\u2e3b<\/p>\n\n\n\n

3.7. Stored Procedure \u2013 Th\u1ee7 t\u1ee5c l\u01b0u tr\u1eef<\/strong><\/p>\n\n\n\n

DELIMITER \/\/<\/p>\n\n\n\n

CREATE PROCEDURE GetUserOrders(IN uid INT)<\/p>\n\n\n\n

BEGIN<\/p>\n\n\n\n

    SELECT * FROM orders WHERE user_id = uid;<\/p>\n\n\n\n

END \/\/<\/p>\n\n\n\n

DELIMITER ;<\/p>\n\n\n\n

\u2e3b<\/p>\n\n\n\n

4. L\u01b0u \u00fd khi l\u00e0m vi\u1ec7c v\u1edbi SQL<\/strong><\/p>\n\n\n\n

\u2022 Lu\u00f4n sao l\u01b0u d\u1eef li\u1ec7u<\/strong> tr\u01b0\u1edbc khi thay \u0111\u1ed5i l\u1edbn<\/p>\n\n\n\n

\u2022 D\u00f9ng LIMIT<\/strong> khi th\u1eed nghi\u1ec7m truy v\u1ea5n<\/p>\n\n\n\n

\u2022 T\u1ed1i \u01b0u ch\u1ec9 m\u1ee5c<\/strong> khi b\u1ea3ng l\u1edbn<\/p>\n\n\n\n

\u2022 B\u1ea3o m\u1eadt<\/strong>: Tr\u00e1nh SQL Injection b\u1eb1ng Prepared Statements<\/p>\n\n\n\n

\u2022 Vi\u1ebft code r\u00f5 r\u00e0ng<\/strong> v\u00e0 c\u00f3 ch\u00fa th\u00edch<\/p>\n\n\n\n

\u2e3b<\/p>\n\n\n\n

5. K\u1ebft lu\u1eadn<\/strong><\/p>\n\n\n\n

SQL l\u00e0 n\u1ec1n t\u1ea3ng quan tr\u1ecdng cho m\u1ecdi l\u1eadp tr\u00ecnh vi\u00ean v\u00e0 qu\u1ea3n tr\u1ecb c\u01a1 s\u1edf d\u1eef li\u1ec7u. Vi\u1ec7c n\u1eafm ch\u1eafc t\u1eeb c\u01a1 b\u1ea3n<\/strong> \u0111\u1ebfn n\u00e2ng cao<\/strong> s\u1ebd gi\u00fap b\u1ea1n l\u00e0m vi\u1ec7c hi\u1ec7u qu\u1ea3, t\u1ed1i \u01b0u hi\u1ec7u su\u1ea5t v\u00e0 \u0111\u1ea3m b\u1ea3o an to\u00e0n d\u1eef li\u1ec7u.<\/p>\n\n\n\n

H\u00e3y b\u1eaft \u0111\u1ea7u t\u1eeb nh\u1eefng c\u00e2u l\u1ec7nh \u0111\u01a1n gi\u1ea3n, sau \u0111\u00f3 d\u1ea7n kh\u00e1m ph\u00e1 JOIN, GROUP BY, SUBQUERY, INDEX\u2026 v\u00e0 \u00e1p d\u1ee5ng v\u00e0o c\u00e1c d\u1ef1 \u00e1n th\u1ef1c t\u1ebf.<\/p>\n\n\n\n

<\/p>\n","protected":false},"excerpt":{"rendered":"

1. Gi\u1edbi thi\u1ec7u v\u1ec1 SQL SQL (Structured Query Language) l\u00e0 ng\u00f4n ng\u1eef truy v\u1ea5n c\u00f3 c\u1ea5u tr\u00fac, \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 t\u01b0\u01a1ng t\u00e1c v\u1edbi h\u1ec7 qu\u1ea3n tr\u1ecb c\u01a1 s\u1edf d\u1eef li\u1ec7u quan h\u1ec7 (RDBMS) nh\u01b0 MySQL, PostgreSQL, SQL Server, Oracle, SQLite,\u2026 SQL cho ph\u00e9p: \u2022 T\u1ea1o v\u00e0 qu\u1ea3n l\u00fd c\u01a1 s\u1edf d\u1eef li\u1ec7u \u2022 Th\u00eam, […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[32],"tags":[],"class_list":["post-74","post","type-post","status-publish","format-standard","hentry","category-thu-vien-lap-trinh"],"yoast_head":"\nSQL C\u01a1 B\u1ea3n v\u00e0 N\u00e2ng Cao \u2013 H\u01b0\u1edbng D\u1eabn To\u00e0n Di\u1ec7n - Solio.online Blog<\/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:\/\/solio.online\/blog\/sql-co-ban-va-nang-cao-huong-dan-toan-dien\/\" \/>\n<meta property=\"og:locale\" content=\"vi_VN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"SQL C\u01a1 B\u1ea3n v\u00e0 N\u00e2ng Cao \u2013 H\u01b0\u1edbng D\u1eabn To\u00e0n Di\u1ec7n - Solio.online Blog\" \/>\n<meta property=\"og:description\" content=\"1. 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