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Ⅰ 关于oracle里过滤重复数据的问题
select A,B max(C) from tab group by A,B
Ⅱ oracle如何查重复数据并显示出来
SELECT *
FROM t_info a
WHERE ((SELECT COUNT(*)
FROM t_info
WHERE Title = a.Title) > 1)
ORDER BY Title DESC
一。查找重复记录
1。查找全部重复记录
Select * From 表 Where 重复字段 In (Select 重复字段 From 表 Group By 重复字段 Having Count(*)>1)
2。过滤重复记录(只显示一条)
Select * From HZT Where ID In (Select Max(ID) From HZT Group By Title)
注:此处显示ID最大一条记录
二。删除重复记录
1。删除全部重复记录(慎用)
Delete 表 Where 重复字段 In (Select 重复字段 From 表 Group By 重复字段 Having Count(*)>1)
2。保留一条(这个应该是大多数人所需要的 ^_^)
Delete HZT Where ID Not In (Select Max(ID) From HZT Group By Title)
注:此处保留ID最大一条记录
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)
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) > 1)
and rowid not in (select min(rowid) from people group by peopleId having count(peopleId )>1)
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)
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,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)
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,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)
补充:
有两个以上的重复记录,一是完全重复的记录,也即所有字段均重复的记录,二是部分关键字段重复的记录,比如Name字段重复,而其他字段不一定重复或都重复可以忽略。
1、对于第一种重复,比较容易解决,使用
select distinct * from tableName
就可以得到无重复记录的结果集。
如果该表需要删除重复的记录(重复记录保留1条),可以按以下方法删除
select distinct * into #Tmp from tableName
drop table tableName
select * into tableName from #Tmp
drop table #Tmp
发生这种重复的原因是表设计不周产生的,增加唯一索引列即可解决。
2、这类重复问题通常要求保留重复记录中的第一条记录,操作方法如下
假设有重复的字段为Name,Address,要求得到这两个字段唯一的结果集
select identity(int,1,1) as autoID, * into #Tmp from tableName
select min(autoID) as autoID into #Tmp2 from #Tmp group by Name,autoID
select * from #Tmp where autoID in(select autoID from #tmp2)
Ⅲ oracle imp 导入命令 怎么过滤重复数据
1、oracle imp 导入先建立表结构,之后对要过重的数据加上主键这样导入就能回过滤。
2、但不答建议在导入时过滤那样性能会慢,可以先进行导入后去重更简单。
DELETE FROM tab
WHERE ROWID NOT IN(SELECT max(ROWID) from tab a
GROUP BY a.col HAVING COUNT(*) > 1)
这样导入后很快。
Ⅳ oracle查询过滤重复相同的数据。
SELECT DISTINCT TA.QA_TYPE TYPE,
TQ.TYPE_DESCRIPTION TYPEDESCRIPTION
FROM T_QA_RULE_DEFINE TA, T_QA_CHECK TQ
WHERE TA.QA_TYPE = TQ.TYPE
AND TA.QA_CHECK_TYPE = TQ.CHECK_TYPE
AND TA.VALID_FLAG = 'Y'
只取这两个字段不就行了么,是不回是你想答要的
Ⅳ oracle 要查询 多个字段 但是要过滤掉 重复的数据 sql 语句怎么写啊 大神们 帮帮忙啊!
distinct后面也可以跟多个字段啊
要么你用group by 但是group by和distinct的效果是一样的。
Ⅵ oracle查询语句过滤重复数据问题
select distinct x,y ferom t;
select x,y from t group by x,y;
select * from t group by x,y having count(*)>1 ;--查出有重复记录的数据,如果having count(*)=1 是查出没有重复记录的数据
select * from t a1 where rowid=(select max(rowid) from t a2 where a2.x=a1.x and a2.y=a1.y); --利用rowid唯一,适用于回少量重复数据
还有 rank over(partition)这个函答数你也可以好好看哈哦
Ⅶ Oracle 根据列值过滤重复数据
select distinct(presonnel_id) from (select id from table_name ordet by DESC ) where rownum < 3
试试
Ⅷ oracle select 如何过滤重复值
select b.DFI_FND_FUND_ID,a.PFU_TOTAL_UNITS,sum(b.DFI_OFFER_PRICE)
from T_POLICY_FUND_UNITS a, T_DAILY_FUND_INFORMATION b
where a.PFU_FND_FUND_ID = b.DFI_FND_FUND_ID
and a.PFU_PFA_POL_POLICY_ID = '1173204101012010'
and a.PFU_LATEST_INDICATOR = 'L'
group by b.DFI_FND_FUND_ID,a.PFU_TOTAL_UNITS
Ⅸ oracle语句如何过滤重复信息
select distinct * from
(select
rec.pk_corp as pk_corp ,
rec.barcode ,
sq.ckxh as ckxh,
case when dcb.pk_ql_qdyt_lc_ckpyjj is not null then 0 else dcb.fsgs end as fsnum ,
dcb.cksh as sqbillno,
dcb.gsnum ,
dcb.sygs as synum ,
dcb.fsgs as jjnum ,
dcb.outbillno ,
dcb.outdate
from ql_qdyt_js_receive rec
left join ql_qdyt_lc_cksq sq on rec.barcode=sq.applysamplenum
left join ql_qdyt_dc_qddc dc on sq.applysamplenum=dc.barcode
left join ql_qdyt_dc_qddc_b dcb on dc.pk_qdyt_dc_qddc=dcb.pk_qdyt_dc_qddc
where nvl(rec.dr,0)=0
and nvl(sq.dr,0)=0
and nvl(dc.dr,0)=0
and nvl(dcb.dr,0)=0
and rec.vbillstatus=1
and dc.vbillstatus=1
and sq.vbillstatus=1
and dcb.pk_qdyt_lc_cksq is not null);