日期:2014-05-16  浏览次数:20383 次

数据库 随机 提取 N条记录
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