- SQL 教程
- SQL 简介
- SQL 语法
- SQL SELECT 语句
- SQL SELECT DISTINCT 语句
- SQL WHERE 子句
- SQL AND & OR 运算符
- SQL ORDER BY 关键字
- SQL INSERT INTO 语句
- SQL UPDATE 语句
- SQL DELETE 语句
- SQL NULL 值
- SQL NULL 函数
- SQL 通用数据类型
- SQL 用于各种数据库的数据类型
-
SQL 高级教程
- SQL SELECT TOP, LIMIT, ROWNUM 子句
- SQL LIKE 操作符
- SQL 通配符
- SQL IN 操作符
- SQL BETWEEN 操作符
- SQL 别名
- SQL 连接(JOIN)
- SQL INNER JOIN 关键字
- SQL LEFT JOIN 关键字
- SQL RIGHT JOIN 关键字
- SQL FULL OUTER JOIN 关键字
- SQL UNION 操作符
- SQL SELECT INTO 语句
- SQL INSERT INTO SELECT 语句
- SQL CREATE DATABASE 语句
- SQL CREATE TABLE 语句
- SQL 约束（Constraints）
- SQL NOT NULL 约束
- SQL UNIQUE 约束
- SQL PRIMARY KEY 约束
- SQL FOREIGN KEY 约束
- SQL CHECK 约束
- SQL DEFAULT 约束
- SQL CREATE INDEX 语句
- SQL 撤销索引、撤销表以及撤销数据库
- SQL ALTER TABLE 语句
- SQL AUTO INCREMENT 字段
- SQL 视图（Views）
- SQL Date 函数
- SQL 函数
SQL 快速参考
| SQL 语句 | 语法 |
|---|---|
| AND / OR | SELECT column_name(s) FROM table_name WHERE condition AND|OR condition |
| ALTER TABLE | ALTER TABLE table_name ADD column_name datatype or ALTER TABLE table_name |
| AS (alias) | SELECT column_name AS column_alias FROM table_name or SELECT column_name |
| BETWEEN | SELECT column_name(s) FROM table_name WHERE column_name BETWEEN value1 AND value2 |
| CREATE DATABASE | CREATE DATABASE database_name |
| CREATE TABLE | CREATE TABLE table_name ( column_name1 data_type, column_name2 data_type, column_name2 data_type, ... ) |
| CREATE INDEX | CREATE INDEX index_name ON table_name (column_name) or CREATE UNIQUE INDEX index_name |
| CREATE VIEW | CREATE VIEW view_name AS SELECT column_name(s) FROM table_name WHERE condition |
| DELETE | DELETE FROM table_name WHERE some_column=some_value or DELETE FROM table_name DELETE * FROM table_name |
| DROP DATABASE | DROP DATABASE database_name |
| DROP INDEX | DROP INDEX table_name.index_name (SQL
Server) DROP INDEX index_name ON table_name (MS Access) DROP INDEX index_name (DB2/Oracle) ALTER TABLE table_name DROP INDEX index_name (MySQL) |
| DROP TABLE | DROP TABLE table_name |
| GROUP BY | SELECT column_name,
aggregate_function(column_name) FROM table_name WHERE column_name operator value GROUP BY column_name |
| HAVING | SELECT column_name,
aggregate_function(column_name) FROM table_name WHERE column_name operator value GROUP BY column_name HAVING aggregate_function(column_name) operator value |
| IN | SELECT column_name(s) FROM table_name WHERE column_name IN (value1,value2,..) |
| INSERT INTO | INSERT INTO table_name VALUES (value1, value2, value3,....) or INSERT INTO table_name |
| INNER JOIN | SELECT column_name(s) FROM table_name1 INNER JOIN table_name2 ON table_name1.column_name=table_name2.column_name |
| LEFT JOIN | SELECT column_name(s) FROM table_name1 LEFT JOIN table_name2 ON table_name1.column_name=table_name2.column_name |
| RIGHT JOIN | SELECT column_name(s) FROM table_name1 RIGHT JOIN table_name2 ON table_name1.column_name=table_name2.column_name |
| FULL JOIN | SELECT column_name(s) FROM table_name1 FULL JOIN table_name2 ON table_name1.column_name=table_name2.column_name |
| LIKE | SELECT column_name(s) FROM table_name WHERE column_name LIKE pattern |
| ORDER BY | SELECT column_name(s) FROM table_name ORDER BY column_name [ASC|DESC] |
| SELECT | SELECT column_name(s) FROM table_name |
| SELECT * | SELECT * FROM table_name |
| SELECT DISTINCT | SELECT DISTINCT column_name(s) FROM table_name |
| SELECT INTO | SELECT * INTO new_table_name [IN externaldatabase] FROM old_table_name or SELECT column_name(s) |
| SELECT TOP | SELECT TOP number|percent column_name(s) FROM table_name |
| TRUNCATE TABLE | TRUNCATE TABLE table_name |
| UNION | SELECT column_name(s) FROM table_name1 UNION SELECT column_name(s) FROM table_name2 |
| UNION ALL | SELECT column_name(s) FROM table_name1 UNION ALL SELECT column_name(s) FROM table_name2 |
| UPDATE | UPDATE table_name SET column1=value, column2=value,... WHERE some_column=some_value |
| WHERE | SELECT column_name(s) FROM table_name WHERE column_name operator value |
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