Removing Duplicates in a single table

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I have the following table and data as follows:

SQL

sno	name	city
1	simbu	bangalore
1	simbu	bangalore
1	simbu	bangalore
1	simbu	bangalore
1	simbu	bangalore
1	simbu	bangalore

now i have to remove the duplicates . how can i accomplish this? the thing is i have not included any primary key. without primary key concept i have to remove duplicates how can i do tat? out of those 6 rows 1 row should remain finally after removing the duplicates. Now can any 1 tell me how can i perform the above operation using ranking functions?

Posted 30-Aug-13 0:49am

ARUN K P

Updated 1-Sep-13 18:32pm

v3

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Garth J Lancaster 30-Aug-13 6:56am

is this exactely the data, or just an example ?

Prakash Thirumoorthy 30-Aug-13 6:57am

do u want to remove from the table? or do u want to remove the duplicate values and show the different values only in result set?

ARUN K P 30-Aug-13 7:11am

that s the data. and i want to delete all the duplicate values and preserve the result set in the same table.

Prakash Thirumoorthy 30-Aug-13 7:15am

i have given answer. check that. it will may help u and solve ur problem.

ARUN K P 30-Aug-13 7:29am

yeah sure :)

4 solutions

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TheUltimateDebugger · Accepted Answer · 2013-08-30T00:58:00

Solution 1

Remove Duplicate Rows from a Table in SQL Server[^]

You can check this...it will help you..

Posted 30-Aug-13 0:58am

TheUltimateDebugger

Comments

ARUN K P 30-Aug-13 7:00am

No i don wanna do it in that way. i know that way. is there any way to delete the duplicate without alteting the table?

Fredrik Bornander · Accepted Answer · 2013-08-30T01:20:00

Solution 4

You could try something like this, assuming your data is in a table called mytable;

SQL

select distinct * into #mytemptable from mytable
truncate table mytable
insert into mytable select * from #mytemptable
drop table #mytemptable

Hope this helps,
Fredrik

Posted 30-Aug-13 1:20am

Fredrik Bornander

Comments

ARUN K P 30-Aug-13 7:30am

thanks

Fredrik Bornander 30-Aug-13 7:49am

Glad I could help.

Thanks7872 30-Aug-13 7:31am

Smarter way to stay fit..:laugh: Upvoted..!!!

Thanks7872 · Accepted Answer · 2013-08-30T01:25:00

Solution 5

Refer these links

Remove Duplicate Rows from a Table in SQL Server[^]

How to remove duplicate rows from a table in SQL Server[^]

SQL SERVER – Delete Duplicate Records – Rows[^]

Delete Duplicate Rows in a SQL Table[^]

Regards..:)

Posted 30-Aug-13 1:25am

Thanks7872

Comments

ARUN K P 30-Aug-13 7:30am

thanks

Thanks7872 30-Aug-13 7:32am

You are welcome. Accept the most relevant solutions only. Always.

Prakash Thirumoorthy · Accepted Answer · 2013-08-30T01:09:00

Solution 2

Hi,
you can do it by using temporary table.

SQL

create table #temp (Sno int, Name varchar(50),  City varchar(50))
insert into #temp select * from Maintable

delete from Maintable

insert into Maintable select distinct * from #Temp


select * from Maintable

drop table #temp

Regards,
Prakash.T

Posted 30-Aug-13 1:09am

Prakash Thirumoorthy

Comments

ARUN K P 30-Aug-13 7:15am

Thanks its working fine . +5

Prakash Thirumoorthy 30-Aug-13 7:16am

yeah! welcome..

Herman<T>.Instance 30-Aug-13 7:18am

bad practice. what happens if inserting to #temp fails?

You can use row_number() over(fields order by fields) fucntionality to find doubles in a table

ARUN K P 30-Aug-13 7:30am

ok fine will try tat way too