SQL DELETE 语句详解
DELETE 语句
DELETE 语句用于删除表中的行。
语法
DELETE FROM 表名称 WHERE 列名称 = 值
Person:
| LastName | FirstName | Address | City |
|---|---|---|---|
| Gates | Bill | Xuanwumen 10 | Beijing |
| Wilson | Fred | Zhongshan 23 | Nanjing |
删除某行
"Fred Wilson" 会被删除：
DELETE FROM Person WHERE LastName = 'Wilson'
结果:
| LastName | FirstName | Address | City |
|---|---|---|---|
| Gates | Bill | Xuanwumen 10 | Beijing |
删除所有行
可以在不删除表的情况下删除所有的行。这意味着表的结构、属性和索引都是完整的：
DELETE FROM table_name
或者：
DELETE * FROM table_name