write a query to delete similar records in same table

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Question Posted / pk

13 Answers
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write a query to delete similar records in same table..

Answer / raj

DELETE FROM EMP E1
WHERE ROWID <(SELECT MAX(ROWID) FROM EMP E2 WHERE E1.ENO =
E2.ENO)

Is This Answer Correct ?

25 Yes

3 No

write a query to delete similar records in same table..

Answer / nirmalendu

delete from table_name where rowid not in(select min(rowid)
from table_name group by column_name);

** column_name which having duplicate record

Is This Answer Correct ?

7 Yes

0 No

write a query to delete similar records in same table..

Answer / manjla

CREATE TABLE User_Details
(
UserID int ,
FName varchar (50),
MName varchar (50),
LName varchar (50),
Email varchar (50)
)

insert into User_Details values(1,'X','Y','Z','X@X.com')
insert into User_Details values(1,'X','Y','Z','X@X.com')
insert into User_Details values(2,'P','Q','R','P@P.com')
insert into User_Details values(3,'M','N','O','M@M.com')
insert into User_Details values(3,'M','N','O','M@M.com')

IF OBJECT_ID('tempdb..#TempTable') IS NOT NULL
DROP TABLE #TempTable
CREATE TABLE #TempTable
(
UserID int ,
FName varchar (50),
MName varchar (50),
LName varchar (50),
Email varchar (50)
)
go
INSERT INTO #TempTable SELECT DISTINCT * FROM User_Details
go
TRUNCATE TABLE User_Details
go
INSERT INTO User_Details SELECT * FROM #TempTable

SELECT * FROM User_Details

Is This Answer Correct ?

5 Yes

0 No

write a query to delete similar records in same table..

Answer / bcaramu

delete from employee
where (empid, empssn)
not in
( select min(empid), empssn
from employee group by empssn);

Is This Answer Correct ?

8 Yes

5 No

write a query to delete similar records in same table..

Answer / kirankumar.vangeti

delete from emp
where rowid not in (select max(rowid)
from emp
group by emp_number);

Is This Answer Correct ?

4 Yes

1 No

write a query to delete similar records in same table..

Answer / apurva

delete from <tablename> rowid not in (select max(rowid)
from <tablename> group by <col.name where there are
repeating records>);

Is This Answer Correct ?

2 Yes

0 No

write a query to delete similar records in same table..

Answer / sivadasan

Sorry for the previous answer....

We can do like this ,

1. First we have to transfer all data from original_table
table to a temporary table .

create table Temp_table as select * from original_table;

2. Delete all record from Original Table....

delete original_table;

3. Now we can write a query by using INSERT and UNION

insert into original_table (select * from temp_table
UNION select * from temp_table);

any issues let me know.....

Is This Answer Correct ?

1 Yes

0 No

write a query to delete similar records in same table..

Answer / santosh kumar

simple answer for deleting duplicate record from a table.....
table:---
create table t1 (id number(5),name varchar2(20));

then:----
insert into t1 values(10,'a');
insert into t1 values(10,'a');
insert into t1 values(20,'b');
insert into t1 values(20,'b');
---after insertion it'll like this----
id name
10 a
10 a
20 b
20 b

-------------------------------------------------------------
delete from t1
where rowid not in (select min(rowid) from t1 group by name);

Is This Answer Correct ?

2 Yes

1 No

write a query to delete similar records in same table..

Answer / manjula

DELETE FROM User_Details WHERE UserID=(
SELECT t1.UserID FROM
( SELECT UserID, count(*) AS Counts FROM User_Details GROUP
BY UserID HAVING count(*) > 1 )AS t1
)

Is This Answer Correct ?

2 Yes

2 No

write a query to delete similar records in same table..

Answer / balaji

delete from sampletable where ids in(select ids from
sampletable group by ids having count(ids)>1)

Is This Answer Correct ?

3 Yes

5 No

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