❶ 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
❷ 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'));
❸ 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
❹ 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
❺ 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