解析Oracle查询和删除JOB的SQL

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@H_403_0@查询删除重复记录的sql语句
<FONT style="COLOR: #ff0000">1、查找表中多余的重复记录,重复记录是根据单个字段(peopleId)来判断
select from people
where peopleId in (select peopleId from people group by peopleId having count(peopleId) > 1)<FONT style="COLOR: #ff0000">2、删除表中多余的重复记录,重复记录是根据单个字段(peopleId)来判断,只留有rowid最小的记录
delete from people
where peopleId in (select peopleId from people group by peopleId having count(peopleId) > @H_403_0@1)
and rowid not in (select min(rowid) from people group by peopleId having count(peopleId )>1)
注:rowid为oracle自带不用该.....
<FONT style="COLOR: #ff0000">3、查找表中多余的重复记录(多个字段)
select
from vitae a
where (a.peopleId,a.seq) in (select peopleId,seq from vitae group by peopleId,seq having count() > 1)
<FONT style="COLOR: #ff0000">
4、删除表中多余的重复记录(多个字段),只留有rowid最小的记录
delete from vitae a
where (a.peopleId,seq having count(
) > 1)
and rowid not in (select min(rowid) from vitae group by peopleId,seq having count()>1)
<FONT style="COLOR: #ff0000">5、查找表中多余的重复记录(多个字段),不包含rowid最小的记录
select
from vitae a
where (a.peopleId,seq having count()>1)
@H_403_0@(二)
比方说
在A表中存在一个字段“name”,
而且不同记录之间的“name”值有可能会相同,
现在就是需要查询出在该表中的各记录之间,“name”值存在重复的项;
Select Name,Count(
) from A Group By Name Having Count() > 1
如果还查性别也相同大则如下:
Select Name,sex,Count(
) from A Group By Name,sex Having Count() > 1
@H_403_0@(三)
<FONT style="COLOR: #0000ff">方法
declare @max integer,@id integer
declare cur_rows cursor local for select 主字段,count(
) from 表名 group by 主字段 having count(*) >; 1
open cur_rows
fetch cur_rows into @id,@max
while @@fetch ......

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