❶ oracle数据库中如何用sql语句查出重复字段以及如何删除
查询可用group by语句，删除则用delete语句。
1、创建测试表，插入测试数据：
createtabletest
(idint,
namevarchar2(20));
insertintotestvalues(1,'张三');
insertintotestvalues(1,'张三');
insertintotestvalues(2,'李四');
insertintotestvalues(2,'李四');
insertintotestvalues(3,'王五');
insertintotestvalues(3,'王五');
insertintotestvalues(3,'王五');
insertintotestvalues(4,'赵六');
commit;
2、查询重复数据，用语句：
selectid,namefromtestgroupbyid,namehavingcount(*)>1;
结果：
deletefromtestwhererowidnotin(selectmin(rowid)fromtestgroupbyid,name);
commit;
❷ Oracle 查询并删除重复记录的SQL语句，如下内容
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)
注:rowid为oracle自带不用该.....
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)
❸ 在Oracle中如何用一条sql语句删除重复的数据（留一条数据）
delete
Emp
p
where
rowid
in
(
select
tmpid
(select
ROW_NUMBER()
OVER(PARTITION
BY
id
)
id
,rowid
tmpid
from
emp
)
where
id
<>
1
)
可以试试
❹ oracle sql语句,如何去掉重复的,我的意思是 如有重复的就都不要
计算name列的数量，取数量为1的
❺ oracle sql 去重复记录不用distinct如何实现
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*frompeople
wherepeopleIdin((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
deletefrompeople
wherepeopleIdin((peopleId)>1)
androwidnotin(selectmin(rowid)(peopleId)>1)
❻ 去除重复问题oracle sql
用 distinct 属性,在select之后加distinct
例：
select distinct *
from table；
select distinct name,age
from table
where 条件；
如果对您有帮助，请记得采纳为满意答案，谢谢！祝您生活愉快！
❼ Oracle删除重复数据的SQL语句 有点疑问
这个只会删除前两条数据
也就是第一，二行的那两条
你可以验证一下
select
rowid,table_name.*
from
table_name;
执行完把几个rowid记下
然后执行你的删除语句，你看最后保留下来的是后两行数据
rowid是记录每条数据的物理位置，你说的把两条1，2删除，不知道你是怎么理解的呢?
❽ oracle的查询sql怎么去重复数据
oracle的查询sql怎么去重复数据
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)
大概酱紫吧。好久没用oracle了
❾ oracle删除重复的行怎么删啊
可用rowid来删除。
如表中有如下数据：
注意事项：delete语句执行后，需要commit提交，否则只在当前session下有效。