⑴ 關於oracle里過濾重復數據的問題
select A,B max(C) from tab group by A,B
⑵ oracle過濾重復數據 rowid 兩張關聯表怎麼用啊
過濾重復數據用distinct ，不過distinct會排序導致資料庫消耗變多
rowid是偽列，一般在索回引的回讀中有用答
兩張表關聯有很多
等值連接和不等值連接
內鏈接 外連接 自連接
一般兩張表通過主鍵外鍵連接，連接條件數=表數-1
⑶ oracle語句如何過濾重復信息
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);
⑷ oracle select 如何過濾重復值
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
⑸ oracle查詢過濾重復相同的數據。
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'
只取這兩來個字源段不就行了么，是不是你想要的
⑹ oracle查詢語句過濾重復數據問題
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 ;--查出有重復記錄的數據，如果having count(*)=1 是查出沒有重復記錄的數據
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，適用於少量重復數據
還有 rank over（partition）這個函數你也可以好好看哈哦
⑺ oracle imp 導入命令 怎麼過濾重復數據
1、oracle imp 導入先建立表結構，之後對要過重的數據加上主鍵這樣導入就能過濾。
2、但不建回議在導入時過濾那樣答性能會慢，可以先進行導入後去重更簡單。
DELETE FROM tab
WHERE ROWID NOT IN(SELECT max(ROWID) from tab a
GROUP BY a.col HAVING COUNT(*) > 1)
這樣導入後很快。
⑻ oracle 要查詢 多個欄位 但是要過濾掉 重復的數據 sql 語句怎麼寫啊 大神們 幫幫忙啊！
distinct後面也可以跟多個欄位啊
要麼你用group by 但是group by和distinct的效果是一樣的。
⑼ Oracle 根據列值過濾重復數據
select distinct(presonnel_id) from (select id from table_name ordet by DESC ) where rownum < 3
試試
⑽ oracle資料庫的過濾問題：如何過濾兩個表中相同的部分數據。比如說A表與B表都有記錄
試試下面的SQL語句是否符合你的需求： --A：
select XX_id
from tiantiantian
where sum_date=20110420
and XX_status < 30
and XX_type in (1009, 1008, 1003, 1011)
and XX_date > to_date(20110420, 'yyyymmdd')
and not exists(
select xx_id from dididi
where sum_date=20110420
and XX_status < 30
and XX_type in (1009, 1008, 1003, 1011)
and XX_date > to_date(20110420, 'yyyymmdd'));
--B：
select XX_id
from dididi
where sum_date=20110420
and XX_status < 30
and XX_type in (2001)
and XX_date > to_date(20110420, 'yyyymmdd')
and not exists(
select xx_id from tiantiantian
where sum_date=20110420
and XX_status < 30
and XX_type in (2001)
and XX_date > to_date(20110420, 'yyyymmdd'));