从数据库表中随机获取N条记录的SQL语句

Oracle:

select * from (select * from tableName order by dbms_random.value) where rownum < N
eg: select * from (select * from t_bd_person order by dbms_random.value) where rownum <= 5

MS SQLServer:

select top N * from tableName order by newid()

My SQL:

select * from tableName order by rand() limit N
eg:select * from t_bd_person order by rand() limit 5

转自：http://blog.csdn.net/senton/article/details/4404101