收集一些工作中常用的经典SQL语句

2、在同一数据表找到相同属性的记录

SELECT RoleName FROM SysRole GROUP BY RoleName HAVING COUNT(ID)>1

3、随机提取记录

SELECT RoleName FROM SysRole ORDER BY NEWID()

4、按照姓氏笔画排序

SELECT RoleName FROM SysRole ORDER BY RoleName COLLATE Chinese_PRC_Stroke_CI_AS

5、获取某个日期所在月份的最大天数

SELECT DAY(DATEADD(dd,-DAY(‘2017-5-12‘),DATEADD(mm,1,‘2017-5-12‘))) as ‘DayNumber‘

6、实现用0或1 来显式 男或女

select name ,Sex=

case Sex

when ‘0‘ then ‘男‘

when ‘1‘ then ‘女‘

end

from Sys_user

7、显式文章、提交人和最后回复时间

select a.title,a.username,b.adddate

from tablename as a ,select(max(adddate)) from tablename

where tablename.title=a.title) b

8、嵌套子查询

select a,b,c from table1 where a in(select a from table2)

9、复制表结构(源表名：a ,目标表名：b)

select * into from a where 1<>1

或者

select top 0 * into [b] from [a]

10、复制表数据(源表名：a ,目标表名：b)

insert into b(name,desc,createtime) as select name,desc,createtime from table1 as a

11、通配符的使用

select * from table1 where name like ‘A-L%‘

--筛选name列首字母在A~L之间的记录

select * from table1 where name like‘[ABCD]%‘

--筛选name列首字母是 A、B、C或D的记录

select * from table1 where name like ‘[A-DH]%‘

--筛选name列首字母在A~D或者是H的记录

select * from table1 where name like ‘[^D]%‘

--筛选name列首字母不是D的记录

select * from table1 where name like ‘Xiao_ming‘

-- _ 匹配任意单个字符

12、操作列

alter table table1 add desc nvarchar(2000) not null default ‘‘ --新增一列

alter table table1 alter column  desc  nvarchar(500) --修改列

alter table table1 drop colmn desc --删除列

13、存储过程

--插入数据的存储过程示例

CREATE procedure [dbo].[proc_CreateUser]

@username nvarchar(200),

@password nvarchar(200),

@truename nvarchar(200),

@role int

as

insert INTO  Users (UserName,Password,TrueName,Role,CreateDate)

VALUES(@username,@password,@truename,@role,GETDATE())

--更新数据示例

CREATE procedure [dbo].[proc_UpdateUser]

@id int,

@username nvarchar(200)

as

update Users

set UserName=@username

where Id=@id

--删除数据

CREATE procedure [dbo].[proc_DelUser]

@id int

as

delete Users where Id=@id

14、视图示例

create view  view_user

as

select　id from user

go

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收集一些工作中常用的经典SQL语句

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