SQLSERVER添加删除列、添加修改删除各种约束

 

 

--添加列

alter table emp_info add test int;

 

--删除列

alter table emp_info drop column tableid;

 

--重命名表名

exec sp_rename 'calss','class';

 

--重命名列明

exec sp_rename 'class.calssname','classname','COLUMN';

 

--改变列长度

 

alter table emp_info alter column address nchar(100)

 

 

---------------------------------------

�添加约束

�添加主键

add constraint PK_stuNo primary key ( studentNO ) studentNo --studentNo 列明

 

�添加非空

alter table student

add constraint LoginPwd check ( LoginPwd is not null)

 

�默认约束

alter table student

add constraint DF_address default ( '地址不详' ) for address ;

 

alter table student student

�检查约束
alter table Student

add constraint CK_borndate CHECK(BornDate>='1980-01-01')

 

�唯一约束

alter table student

add constraint UQ_identityCard Unique ( identityCard )

 

�外键约束

alter table result

add constraint FK_stuNo foreign key ( studentNo ) �外键列名

references student ( studentNo ) �student 主表

�删除约束

alter table student

drop constraint CK_borndate

 

 

转自 http://www.zhjie.net/sqlserver-add-various-constraints.htm