Remove rows with duplicate values [duplicate]

Answer 1

SELECT 
MIN(id) AS id,
gid,
url
FROM yourTable
GROUP BY gid, url 

Answer 2

;WITH x AS 
(
   SELECT id, gid, url, rn = ROW_NUMBER() OVER
     (PARTITION BY gid, url ORDER BY id) 
   FROM dbo.table
)
SELECT id,gid,url FROM x WHERE rn = 1 -- the rows you'll keep
-- SELECT id,gid,url FROM x WHERE rn > 1 -- the rows you'll delete
-- DELETE x WHERE rn > 1; -- do the delete

Once you're happy with the first select, which indicates the rows you'll keep, remove it and un-comment the second select. Once you're happy with that, which indicates the rows you'll delete, remove it and un-comment the delete.

And if you don't want to delete data, just ignore the commented lines under the SELECT...