代码如下:
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
代码如下:
select name,Sex=(case Sex when '1' then '男' when '0' then '女' end) from Tablename
3．嵌套子查询
代码如下:
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
代码如下:
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
代码如下:
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
代码如下:
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
代码如下:
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
代码如下:
select * from UserValue where UserID between 2 and 5;
9．日程安排提前5 分钟提醒
代码如下:
Select * from TabSchedule where datediff(minute,getdate(),开始时间)