參考文章：
http://database.51cto.com/art/201011/235159.htm
1，查找表中多余的重復(fù)記錄，重復(fù)記錄是根據(jù)單個字段來判斷
select * from people
where peopleId in (select peopleId from people group by peopleId having count
(peopleId) > 1)
2，刪除表中多余的重復(fù)記錄，重復(fù)記錄是根據(jù)單個字段來判斷，只留有rowid最小的記錄
delete from people
where peopleId in (select peopleId from people group by peopleId having count
(peopleId) > 1)
and rowid not in (select min(rowid) from people group by peopleId having count(peopleId
)>1)
3，查找表中對于的重復(fù)記錄（多個字段）
select * from vitae a
where (a.peopleId,a.seq) in (select peopleId,seq from vitae group by peopleId,seq having
count(*) > 1)
4，刪除表中多余的重復(fù)記錄（多個字段），只保留rowid最小的記錄
delete from vitae a
where (a.peopleId,a.seq) in (select peopleId,seq from vitae group by peopleId,seq having
count(*) > 1)
and rowid not in (select min(rowid) from vitae group by peopleId,seq having count(*)>1)
