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how to find duplicate records

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Topic

rudba
Constraint Violating Yak Guru

415 Posts

Posted - 2009-05-11 : 17:24:44

How do i update duplicate email address?
I have to update Repit='Y' if there are duplicate email address on the table.

declare @tbl1 table
(ID INT,
Email varchar(12),
Repit varchar(1)
)

INSERT INTO @tbl1
SELECT 1, 'abc@aa.com',null

INSERT INTO @tbl1
SELECT 2, 'bb@bb.com',null

INSERT INTO @tbl1
SELECT 3, 'abc@aa.com',null

INSERT INTO @tbl1
SELECT 4, 'xyz@bb.com',null

Skorch
Constraint Violating Yak Guru

300 Posts

Posted - 2009-05-11 : 18:32:59

UPDATE @tbl1
SET Repit = 'Y'
WHERE Email IN (SELECT Email FROM @tbl1 GROUP BY Email HAVING COUNT(Email)>1)

Some days you're the dog, and some days you're the fire hydrant.

Nageswar9
Aged Yak Warrior

600 Posts

Posted - 2009-05-12 : 00:17:20

Hi try this once,

update t
set Repit = 'Y'
from ( select *,row_number() over ( partition by email order by id) as rd from @tbl1) as t
where t.rd > 1

bklr
Master Smack Fu Yak Hacker

1693 Posts

Posted - 2009-05-12 : 01:49:08

update t
set repit ='y'
from( select repit, count(email)over (partition by email) as cnt from @tbl1
)t where cnt >1
select * from @tbl1

visakh16
Very Important crosS Applying yaK Herder

52326 Posts

Posted - 2009-05-12 : 09:54:22

quote:
Originally posted by Nageswar9

Hi try this once,

update t
set Repit = 'Y'
from ( select *,row_number() over ( partition by email order by id) as rd from @tbl1) as t
where t.rd > 1

this will not update the first record's repit field for repeating email value

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