SQL 入门
SQL 简介
SQL 语法
SQL 通用数据类型
SQL 语句快速参考
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 SELECT TOP, LIMIT, ROWNUM
SQL LIKE 操作符
SQL 通配符
SQL IN 操作符
SQL BETWEEN 操作符
SQL Join连接
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 高级教程
SQL 撤销索引、表以及数据库
SQL CREATE DATABASE 语句
SQL CREATE TABLE 语句
SQL ALTER TABLE 语句
SQL AUTO INCREMENT 字段
SQL CREATE VIEW、REPLACE VIEW、 DROP VIEW 语句
SQL Server 和 MySQL 中的 Date 函数
SQL NULL 值 – IS NULL 和 IS NOT NULL
SQL 进阶
SQL 别名
SQL 约束
SQL NOT NULL 约束
SQL UNIQUE 约束
SQL PRIMARY KEY 约束
SQL FOREIGN KEY 约束
SQL DEFAULT 约束
SQL CHECK 约束
SQL 使用连接
SQL UNION 子句
SQL NULL 值
SQL 克隆数据表
SQL 索引
SQL 子查询
SQL ALTER TABLE 命令
SQL TRUNCATE TABLE 命令
SQL 处理重复数据
SQL 使用视图
SQL 注入
SQL HAVING 子句
SQL 事务
SQL 使用序列
SQL 通配符
SQL 临时表
SQL MS Access、MySQL 和 SQL Server 数据类型
SQL 函数
SQL 日期函数
SQL 函数
SQL AVG() 函数
SQL COUNT() 函数
SQL FIELD()函数
SQL FIRST() 函数
SQL LAST() 函数
SQL MAX() 函数
SQL MIN() 函数
SQL SUM() 函数
SQL GROUP BY 语句
SQL HAVING 子句
SQL UPPER(),LOWER()函数
SQL UPPER()函数
SQL LOWER()函数
SQL UCASE() 函数
SQL LCASE() 函数
SQL MID() 函数
SQL LEN() 函数
SQL ROUND() 函数
SQL NOW() 函数
SQL FORMAT() 函数
SQL SQRT() 函数
SQL RAND() 函数
SQL CONCAT() 函数
SQL ISNULL()、NVL()、IFNULL() 和 COALESCE() 函数
SQL REPLACE()函数
SQL TRIM()函数
SQL 语句快速参考 - SQL教程 - IT书包
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SQL 语句快速参考
<table class="table"><tbody><tr><th width="27%" align="left" valign="top">SQL 语句</th><th width="73%" align="left" valign="top">语法</th></tr><tr><td align="left" valign="top">AND / OR</td><td align="left" valign="top">SELECT column_name(s)<br /> FROM table_name<br /> WHERE condition<br /> AND|OR condition</td></tr><tr><td align="left" valign="top">ALTER TABLE</td><td align="left" valign="top">ALTER TABLE table_name <br /> ADD column_name datatype <p>or</p><p>ALTER TABLE table_name <br /> DROP COLUMN column_name</p></td></tr><tr><td align="left" valign="top">AS (alias)</td><td align="left" valign="top">SELECT column_name AS column_alias<br /> FROM table_name <p>or</p><p>SELECT column_name<br /> FROM table_name AS table_alias</p></td></tr><tr><td align="left" valign="top">BETWEEN</td><td align="left" valign="top">SELECT column_name(s)<br /> FROM table_name<br /> WHERE column_name<br /> BETWEEN value1 AND value2</td></tr><tr><td align="left" valign="top">CREATE DATABASE</td><td align="left" valign="top">CREATE DATABASE database_name</td></tr><tr><td align="left" valign="top">CREATE TABLE</td><td align="left" valign="top">CREATE TABLE table_name<br /> (<br /> column_name1 data_type,<br /> column_name2 data_type,<br /> column_name2 data_type,<br /> ...<br /> )</td></tr><tr><td align="left" valign="top">CREATE INDEX</td><td align="left" valign="top">CREATE INDEX index_name<br /> ON table_name (column_name) <p>or</p><p>CREATE UNIQUE INDEX index_name<br /> ON table_name (column_name)</p></td></tr><tr><td align="left" valign="top">CREATE VIEW</td><td align="left" valign="top">CREATE VIEW view_name AS<br /> SELECT column_name(s)<br /> FROM table_name<br /> WHERE condition</td></tr><tr><td align="left" valign="top">DELETE</td><td align="left" valign="top">DELETE FROM table_name<br /> WHERE some_column=some_value <p>or</p><p>DELETE FROM table_name <br /> (<strong>Note: </strong>Deletes the entire table!!)</p><p>DELETE * FROM table_name <br /> (<strong>Note: </strong>Deletes the entire table!!)</p></td></tr><tr><td align="left" valign="top">DROP DATABASE</td><td align="left" valign="top">DROP DATABASE database_name</td></tr><tr><td align="left" valign="top">DROP INDEX</td><td align="left" valign="top">DROP INDEX table_name.index_name (SQL Server)<br /> DROP INDEX index_name ON table_name (MS Access)<br /> DROP INDEX index_name (DB2/Oracle)<br /> ALTER TABLE table_name<br /> DROP INDEX index_name (MySQL)</td></tr><tr><td align="left" valign="top">DROP TABLE</td><td align="left" valign="top">DROP TABLE table_name</td></tr><tr><td align="left" valign="top">GROUP BY</td><td align="left" valign="top">SELECT column_name, aggregate_function(column_name)<br /> FROM table_name<br /> WHERE column_name operator value<br /> GROUP BY column_name</td></tr><tr><td align="left" valign="top">HAVING</td><td align="left" valign="top">SELECT column_name, aggregate_function(column_name)<br /> FROM table_name<br /> WHERE column_name operator value<br /> GROUP BY column_name<br /> HAVING aggregate_function(column_name) operator value</td></tr><tr><td align="left" valign="top">IN</td><td align="left" valign="top">SELECT column_name(s)<br /> FROM table_name<br /> WHERE column_name<br /> IN (value1,value2,..)</td></tr><tr><td align="left" valign="top">INSERT INTO</td><td align="left" valign="top">INSERT INTO table_name<br /> VALUES (value1, value2, value3,....) <p><em>or</em></p><p>INSERT INTO table_name<br /> (column1, column2, column3,...)<br /> VALUES (value1, value2, value3,....)</p></td></tr><tr><td align="left" valign="top">INNER JOIN</td><td align="left" valign="top">SELECT column_name(s)<br /> FROM table_name1<br /> INNER JOIN table_name2 <br /> ON table_name1.column_name=table_name2.column_name</td></tr><tr><td align="left" valign="top">LEFT JOIN</td><td align="left" valign="top">SELECT column_name(s)<br /> FROM table_name1<br /> LEFT JOIN table_name2 <br /> ON table_name1.column_name=table_name2.column_name</td></tr><tr><td align="left" valign="top">RIGHT JOIN</td><td align="left" valign="top">SELECT column_name(s)<br /> FROM table_name1<br /> RIGHT JOIN table_name2 <br /> ON table_name1.column_name=table_name2.column_name</td></tr><tr><td align="left" valign="top">FULL JOIN</td><td align="left" valign="top">SELECT column_name(s)<br /> FROM table_name1<br /> FULL JOIN table_name2 <br /> ON table_name1.column_name=table_name2.column_name</td></tr><tr><td align="left" valign="top">LIKE</td><td align="left" valign="top">SELECT column_name(s)<br /> FROM table_name<br /> WHERE column_nameLIKE pattern</td></tr><tr><td align="left" valign="top">ORDER BY</td><td align="left" valign="top">SELECT column_name(s)<br /> FROM table_name<br /> ORDER BY column_name [ASC|DESC]</td></tr><tr><td align="left" valign="top">SELECT</td><td align="left" valign="top">SELECT column_name(s)<br /> FROM table_name</td></tr><tr><td align="left" valign="top">SELECT *</td><td align="left" valign="top">SELECT *<br /> FROM table_name</td></tr><tr><td align="left" valign="top">SELECT DISTINCT</td><td align="left" valign="top">SELECT DISTINCT column_name(s)<br /> FROM table_name</td></tr><tr><td align="left" valign="top">SELECT INTO</td><td align="left" valign="top">SELECT *<br /> INTO new_table_name [IN externaldatabase]<br /> FROM old_table_name <p><em>or</em></p><p>SELECT column_name(s)<br /> INTO new_table_name [IN externaldatabase]<br /> FROM old_table_name</p></td></tr><tr><td align="left" valign="top">SELECT TOP</td><td align="left" valign="top">SELECT TOP number|percent column_name(s)<br /> FROM table_name</td></tr><tr><td align="left" valign="top">TRUNCATE TABLE</td><td align="left" valign="top">TRUNCATE TABLE table_name</td></tr><tr><td align="left" valign="top">UNION</td><td align="left" valign="top">SELECT column_name(s) FROM table_name1<br /> UNION<br /> SELECT column_name(s) FROM table_name2</td></tr><tr><td align="left" valign="top">UNION ALL</td><td align="left" valign="top">SELECT column_name(s) FROM table_name1<br /> UNION ALL<br /> SELECT column_name(s) FROM table_name2</td></tr><tr><td align="left" valign="top">UPDATE</td><td align="left" valign="top">UPDATE table_name<br /> SET column1=value, column2=value,...<br /> WHERE some_column=some_value</td></tr><tr><td align="left" valign="top">WHERE</td><td align="left" valign="top">SELECT column_name(s)<br /> FROM table_name<br /> WHERE column_name operator value</td></tr></tbody></table>
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SQL 通用数据类型
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SQL Select 语句
