Remove Duplicate Chars From String



Remove Duplicate Chars From String

CREATE FUNCTION dbo.REMOVE_DUPLICATE_INSTR
(@datalen_tocheck INT,@string VARCHAR(255))
RETURNS VARCHAR(255)
AS
BEGIN
DECLARE @str VARCHAR(255)
DECLARE @count INT
DECLARE @start INT
DECLARE @result VARCHAR(255)
DECLARE @end INT
SET @start=1
SET @end=@datalen_tocheck
SET @count=@datalen_tocheck
SET @str = @string
WHILE (@count <=255)
BEGIN
IF (@result IS NULL)
BEGIN
SET @result=''
END
SET @result=@result+SUBSTRING(@str,@start,@end)
SET @str=REPLACE(@str,SUBSTRING(@str,@start,@end),'')
SET @count=@count+@datalen_tocheck
END
RETURN @result
END
GO
Usage:
SET CONCAT_NULL_YIELDS_NULL OFF
SELECT dbo.Remove_duplicate_instr(<CHAR lengthOF a duplicate SUBSTRING >,<string contain duplicate>)
Example:
To keep char set in a string unique and remove duplicate 3 char long string run this UDF as inline function.
SET CONCAT_NULL_YIELDS_NULL OFF
SELECT dbo.Remove_duplicate_instr(3,123456789123456456)
Resultset:
123456789

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