❶ oracle資料庫中如何用sql語句查出重復欄位以及如何刪除
查詢可用group by語句，刪除則用delete語句。
1、創建測試表，插入測試數據：
createtabletest
(idint,
namevarchar2(20));
insertintotestvalues(1,'張三');
insertintotestvalues(1,'張三');
insertintotestvalues(2,'李四');
insertintotestvalues(2,'李四');
insertintotestvalues(3,'王五');
insertintotestvalues(3,'王五');
insertintotestvalues(3,'王五');
insertintotestvalues(4,'趙六');
commit;
2、查詢重復數據，用語句：
selectid,namefromtestgroupbyid,namehavingcount(*)>1;
結果：
deletefromtestwhererowidnotin(selectmin(rowid)fromtestgroupbyid,name);
commit;
❷ Oracle 查詢並刪除重復記錄的SQL語句，如下內容
1、查找表中多餘的重復記錄，重復記錄是根據單個欄位（peopleId）來判斷
select * from people
where peopleId in (select peopleId from people group by peopleId
having count(peopleId) > 1)
2、刪除表中多餘的重復記錄，重復記錄是根據單個欄位（peopleId）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)
注:rowid為oracle自帶不用該.....
3、查找表中多餘的重復記錄（多個欄位）
select * from vitae a
where (a.peopleId,a.seq) in (select peopleId,seq from vitae group by
peopleId,seq having count(*) > 1)
4、刪除表中多餘的重復記錄（多個欄位），只留有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)
5、查找表中多餘的重復記錄（多個欄位），不包含rowid最小的記錄
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)
❸ 在Oracle中如何用一條sql語句刪除重復的數據（留一條數據）
delete
Emp
p
where
rowid
in
(
select
tmpid
(select
ROW_NUMBER()
OVER(PARTITION
BY
id
)
id
,rowid
tmpid
from
emp
)
where
id
<>
1
)
可以試試
❹ oracle sql語句,如何去掉重復的,我的意思是 如有重復的就都不要
計算name列的數量，取數量為1的
❺ oracle sql 去重復記錄不用distinct如何實現
1、查找表中多餘的重復記錄，重復記錄是根據單個欄位(peopleId)來判斷
select*frompeople
wherepeopleIdin((peopleId)>1)
2、刪除表中多餘的重復記錄，重復記錄是根據單個欄位(peopleId)來判斷，只留有rowid最小的記錄
deletefrompeople
wherepeopleIdin((peopleId)>1)
androwidnotin(selectmin(rowid)(peopleId)>1)
❻ 去除重復問題oracle sql
用 distinct 屬性,在select之後加distinct
例：
select distinct *
from table；
select distinct name,age
from table
where 條件；
如果對您有幫助，請記得採納為滿意答案，謝謝！祝您生活愉快！
❼ Oracle刪除重復數據的SQL語句 有點疑問
這個只會刪除前兩條數據
也就是第一，二行的那兩條
你可以驗證一下
select
rowid,table_name.*
from
table_name;
執行完把幾個rowid記下
然後執行你的刪除語句，你看最後保留下來的是後兩行數據
rowid是記錄每條數據的物理位置，你說的把兩條1，2刪除，不知道你是怎麼理解的呢?
❽ oracle的查詢sql怎麼去重復數據
oracle的查詢sql怎麼去重復數據
select * from table t1
where not exists (select 1 from table t2 where t1.colA=t2.colA and t1.colB=t2.colB and t1.colC=t2.colC and t2.rowid>t1.rowid)
大概醬紫吧。好久沒用oracle了
❾ oracle刪除重復的行怎麼刪啊
可用rowid來刪除。
如表中有如下數據：
注意事項：delete語句執行後，需要commit提交，否則只在當前session下有效。