·

1.953K

· Mortezaipo

In a project I had a problem that the system made duplicate rows in my table.

My table fields are : id,from,to,msg,created => example: 1,1000,2000,'hi this is test' ,'2013-12-12'

So for getting duplicates rows :

SELECT id, COUNT( * ) AS c, `to` , `msg` 
FROM `my-queue` 
GROUP BY `to` , `msg` 
HAVING c >1

Now for removing duplicate rows :

DELETE FROM `my-queue` WHERE id IN 
(
 SELECT id FROM 
 (
 SELECT id, COUNT( * ) AS c, `to` , `msg` 
 FROM `my-queue` 
 GROUP BY `to` , `msg` 
 HAVING c >1
 ) as tem1
)

That was simple , but useful.

Be success

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