1．SQL 插入语句得到自动生成的递增ID 值
insert into Table1(Name,des,num) values ('ltp','thisisbest',10);
select @@identity as 'Id'
2．实现是1 或0 想显示为男或女
select name,Sex=(case Sex when '1' then '男' when '0' then '女' end) from Tablename
3．嵌套子查询
select a,b,c from Table1 where a IN (select a from Table2)
4．显示文章、提交人和最后回复时间
select a.title,a.username,b.adddate from tablename a,(select max(adddate) adddate from tablename where tablename.title=a.title) b
5．随机提取条记录的例子
SQL Server：Select Top 10 * From Tablename order By NewID()
Access：Select Top 10 * From Tablename order By Rnd(ID)
Rnd(ID) 其中的ID 是自动编号字段，可以利用其他任何数值来完成，比如用姓名字段UserName
Select Top 10 * From 表Order BY Rnd(Len(UserName))
MySql：Select * From 表Order By Rand() Limit 10
6．在同一表内找相同属性的记录
select UserID from Accounts_Users where UserName is not null group by UserID having count (*)>1
7．查询类别所有的产品对应数据
Select CategoryName,ProductName FROM Categories LEFT JOIN Products ON Categories.CategoryID = Products.CategoryID;
8．按范围查询编号在2 到5 之间的用户信息
select * from UserValue where UserID between 2 and 5;
9．日程安排提前5 分钟提醒
Select * from TabSchedule where datediff(minute,getdate(),开始时间)<5
10．得出某日期所在月份的最大天数
Select DAY(DATEADD(dd, -DAY('2008-02-13'),DATEADD(mm, 1, '2008-02-13'))) AS 'DayNumber'
11．按姓氏笔画排序
Select * From TableName order By CustomerName Collate Chinese_PRC_Stroke_ci_as
12．通配符的一些用法
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select * from tablename where column1 like '[A-M]%' 这样可以选择出column 字段中首字母在A-M 之间的记录
-
select * from tablename where column1 like '[ABC]%' 这样可以选择出column 字段中首字母是A 或者B 或者C 的记录
-
select * from tablename where column1 like '[A-CG]%' 这样可以选择出column 字段中首字母在A-C 之间的或者是G 的记录
-
select * from tablename where column1 like '[^C]%' 这样可以选择出column 字段中首字母不是C 的记录
13．复制表结构（只复制结构,源表名：a，目标表名：b）
select * into b from a where 1<>1 或 select top 0 * into [b] from [a]
14．复制表数据（复制数据，源表名：a，目标表名：b）
insert into b(Name,des,num) select Name,des,num from Table1;
15. 创建分页存储过程
--创建分页的存储过程
create proc usp_GetPagedData
@pageIndex int, --页码
@pageSize int, --每页显示几条
@pageCount int output --共多少页
as
declare @count int
select @count = count(*) from TableName
set @pageCount = ceiling(@count*1.0/@pageSize)
select * from
(select *,ROW_NUMBER() over(order by ColumnName desc) as num
from TableName) as t
where num between (@pageIndex-1)*@pageSize + 1 and @pageIndex*@pageSize
--测试存储过程
declare @n int
exec usp_GetPagedData 3,4,@n output
print @n
