Write a query to delete duplicate records in SQL SERVER

Answers were Sorted based on User's Feedback



Write a query to delete duplicate records in SQL SERVER..

Answer / dharmesh

your table look like this and want to delete duplicate
record

chandran 23
ranjith 24
chandran 23


delete top(1) from tablename where name='chandran' and
age=23

Is This Answer Correct ?    3 Yes 28 No

Write a query to delete duplicate records in SQL SERVER..

Answer / sonia

Create table info(comp_id int identity(101,1),comp_name
varchar(50))
insert into info values('Progressive Ltd.')
insert into info values('Progressive Ltd.')
insert into info values('EliResearch')
insert into info values('Patni')
insert into info values('Accenture')
insert into info values('Accenture')
select * from info

DELETE FROM info
WHERE comp_name IN
(SELECT comp_name FROM info
GROUP BY comp_name HAVING COUNT(comp_name) > 1)

Is This Answer Correct ?    12 Yes 38 No

Write a query to delete duplicate records in SQL SERVER..

Answer / anil

delete from tab_nam where

Is This Answer Correct ?    2 Yes 30 No

Write a query to delete duplicate records in SQL SERVER..

Answer / skumar

Hi friends, please just try out this. This works fine for me.

We have lot of methods to do this. But using temp table,
drop the original table,retain the temp as orinial is not a
good pratice.

When u have large no of data it will affect ur performance.


DELETE FROM employee WHERE((SELECT eid,COUNT(eid) FROM
employee GROUP BY eid) > 1)

Is This Answer Correct ?    15 Yes 46 No

Write a query to delete duplicate records in SQL SERVER..

Answer / chandran.s

Table Name: Example

Name Age
chandran 23
ranjith 24
chandran 23

To delete one of the duplicate records use following query


delete from example where age in(select age from example
group by age having count>1)

Is This Answer Correct ?    13 Yes 46 No

Write a query to delete duplicate records in SQL SERVER..

Answer / chandran

There is a table like this: tablename: example


Name Age
chandran 23
ranjith 24
chandran 23

In this table the name:chandran and age:23 are the
duplicate records .so we need to delete this using this
sql statements


delete from example group by name,age having count>1

Is This Answer Correct ?    37 Yes 107 No

Post New Answer

More SQL Server Interview Questions

What is filestream?

0 Answers  


Delete duplicate records from the table?(Table must have unique id)

7 Answers   TCS, Thomson Reuters,


What is acid db?

0 Answers  


What are the new scripting capabilities of ssms? : sql server management studio

0 Answers  


How to find the login name linked to a given user name?

0 Answers  






What is enhanced database mirroring in sql server 2008?

0 Answers  


How to get a list of columns in a view using "sys.columns" in ms sql server?

0 Answers  


What is the difference between function and stored procedure in sql server?

0 Answers  


how many clustered indexes can be created on a table? : Sql server database administration

0 Answers  


List out the differences between the clustered index and non-clustered index in sql server?

0 Answers  


What is full outer join in sql server joins?

0 Answers  


Why we use trigger in sql server with example?

0 Answers  


Categories