Mysql语句如何实现从数据库表中查询随机数据的记录 1. Oracle,随机查询20条 select * from ( select * from 表名 order by dbms_random.value ) where rownum = 20; 2.MS SQL Server，随机查询20条 select top 20 * from 表名

update v9_hits SET hitsid = REPLACE(hitsid,c-12-,c-13-) where 1 = ( case when(select COUNT(*) from v9_photo where id=replace(hitsid,c-12-,))0 then 1 else 0 end) updatev9_hitsSEThitsid=REPLACE(hitsid,c-12-,c-13-) fromv9_hits,v9_photowhereid=