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必须会的SQL语句(二)创建表、修改表结构、删除表 - 站长搜索
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必须会的SQL语句(二)创建表、修改表结构、删除表

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2022-09-23 17:34:14 转载来源: 网络整理/侵权必删

1.创建数据库表--使用哪个数据库,如果不写这一句是默认的数据库,也可以用鼠标选当前数据库usetestDB--创建表CreateTabletablename(--id表示字段名--int数据类型--primarykey主键--notnull非空--identity(1,1)初始值是1每次自增长1idintprimarykeynotnullidentity(1,1),--unique唯一namevarchar(20)notnullunique)2

1.创建数据库表

--使用哪个数据库,如果不写这一句是默认的数据库,也可以用鼠标选当前数据库use testDB--创建表  Create Table tablename  (     --id表示字段名     --int 数据类型     --primary key 主键     --not null 非空     --identity(1,1)初始值是1 每次自增长1     id int primary key not null identity(1,1),     --unique 唯一     name varchar(20) not null unique  )

2.删除
Drop table 表名
 
3.修改结构

--增加列
Alter table 表名
Add 列名 类型
--删除列
Alter table 表名
  drop cloumn 列名
--修改列,修改列类型
Alter table 表名
Alter column 列名 type

标签: 必须 会的 SQL 语句 创建 修改 结构 删除


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