作为一枚程序员来说和数据库打交道是不可避免的，现收集一下工作
中常用的SQL语句，希望能给大家带来一些帮助，当然可能不全面，欢迎补充！
1、执行插入语句，获取自动生成的递增的ID值
INSERT INTO SysRole (RoleName,RoleDesc) VALUES(‘超级管理员’,’描述’)
SELECT @@identity as ‘id’
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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