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各种数据库随机获取N条记录的操作语法

2010-06-30 17:57 344 查看
随机取出n条记录：

mysql:

Select * From tablename order By rand() Limit n


SqlServer:

select top n * from tablename order by newid()


Access:

 
Select top n * FROM tablename orDER BY Rnd(id)


Oracle：

 
Select * from (select * from tablename order by sys_guid()) where rownum < n
Select * from (select * from tablename order by dbms_random.value) where rownum < n

DB2:

Select * from tablename order by rand() fetch first n rows only
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标签：  数据库 sqlserver access oracle mysql db2
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