用户名:匿名用户
1、查找表中多余的重复记录,重复记录是根据单个字段(Id)来判断; selec医答属t*from表whereIdin(selectIdfrom表groupbyIdh**in问答gcount(Id)>1)
2、删除表中多余的重复记录,重复记科操列比掌岩录是根据单个字段(Id)来判断,只留有rowi未光注能山并击略基从d最小的记录; DELETEfrom表Wh**ERE(id)IN(**LECTidFROM表GROUPBYidh****INGCOUNT(id均写十石介欢够植)>1)ANDROWIDNOTIN(**LECTMIN(ROW东压短ID)FROM表GROUPBYidh****INGCOUNT(*)>1);
3、息演不食比免句且量抗境查找表中多余的重得神调上有运念停聚后带复记录(多个字段); select*from表awhere(a.Id,a.seq)in(selectId,seqfrom表g历肥善热读触井白哥贵病roupbyId,seqh**ingcount(*)>1)
4、删除表中多余的重复记录(多个育字段),只留有r用色船灯食继顾坐次死owid最小的记录; deletefrom表awhere(a.I校厚酸高护次静d,a.seq)in(selectId,seqfrom表groupbyId,seqh**ingcount(*)>1)androwidnotin(selectmin(rowid请)from表groupbyId,seqh**ingcount(*)>1)
5、查找表中多余香夫鱼明维够略么位的重复记录(多个字段),不包含rowid最小的记录; select*from表awhere(a.Id,a.seq)in(selectId,seqfrom表groupbyId,seqh**ingcount(*)>1)androwidnotin(select里茶宁关鲜黑需步究京较min(rowid)from表groupbyId,seqh**ingcount(*)>1)