首页 > 数据库 > SQL Server > 正文

order by newid() 各种数据库随机查询的方法

2020-07-25 13:06:41
字体:
来源:转载
供稿:网友

SQL Server:

复制代码 代码如下:

Select TOP N * From TABLE Order By NewID()  
view plaincopy to clipboardprint?
Select TOP N * From TABLE Order By NewID()

Select TOP N * From TABLE Order By NewID()


NewID()函数将创建一个 uniqueidentifier 类型的唯一值。上面的语句实现效果是从Table中随机读取N条记录。

Access:

复制代码 代码如下:

Select TOP N * From TABLE Order By Rnd(ID)   
view plaincopy to clipboardprint?
Select TOP N * From TABLE Order By Rnd(ID) 

Select TOP N * From TABLE 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)
复制代码 代码如下:

Select TOP N * From TABLE Order BY Rnd(Len(UserName))  
view plaincopy to clipboardprint?
Select TOP N * From TABLE Order BY Rnd(Len(UserName))

Select TOP N * From TABLE Order BY Rnd(Len(UserName))


MySql:
复制代码 代码如下:

Select * From TABLE Order By Rand() Limit 10  
view plaincopy to clipboardprint?
Select * From TABLE Order By Rand() Limit 10

Select * From TABLE Order By Rand() Limit 10

postgreSQL:

复制代码 代码如下:

select * from glxt022 order by random() limit 5  
view plaincopy to clipboardprint?
select * from glxt022 order by random() limit 5

发表评论 共有条评论
用户名: 密码:
验证码: 匿名发表