Deleting Duplicate Rows

--author: barkın ünüulu

--**************************************
-- Name: Deleting Duplicate Rows
-- Description:The Purpose of this code
-- is to delete the duplicate values occuring in a table. This code is column-orien
-- ted. That means the code works for the duplicate values occuring in a specified
-- column and deletes the values of the rows corresponding to that column.
-- By: barkın ünüulu
--
-- Inputs:I am going to specify the column name as COLUMNNAME and table name as
-- TABLENAME. It should be noted that the developers that are willing to run this c
--ode should put an "id" column in to their tables, which increments automatically
-- Side Effects:As the row number increa
-- ses, the time elapsed for the code increases...
--
--**************************************

DECLARE @i int
DECLARE @j int
DECLARE @k int
SET @k=(select count(*) FROM TABLENAME)
SET @i=1
WHILE @i<=@k
BEGIN
SET @j=@i+1
WHILE @j<=@k
BEGIN
IF ((select COLUMNNAME FROM TABLENAME WHERE ID=@i)=
(select COLUMNNAME FROM TABLENAME WHERE ID=@j))
begin
DELETE FROM TABLENAME
WHERE ID=@j
end
SET @j=@j+1
end
SET @i=@i+1
END