常用SQL语句

1.创建唯一索引

create unique index activityConfigDetail_ConfigIdPageLocation
on activityConfigDetail(ConfigId,PageLocation)

2.创建普通索引

create  index activityConfigDetail_ConfigIdPageLocation
on activityConfigDetail(ConfigId,PageLocation)

3.更改列的类型

alter table [dbo].[ActivityConfigInfo]
alter column [DayPrjMin] int null

4.删除约束

alter table [dbo].[ActivityConfigInfo]
drop constraint DF__ActivityC__DayPr__7325FEFD

5.添加字段

alter table [dbo].[ActivityConfigInfo]
add [DayPrjMin] int null

6.删除字段

if exists(select * from syscolumns where id=object_id('Table1') and name='Field1')
begin
alter table Table1
drop column Field1
end

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