Tuesday, September 21, 2010

Using Cross Apply to Use Like Operator on delimitted string values

Declare @vTable TABLE(id INT, NAME VARCHAR(100))
INSERT INTO @vTable
    SELECT 1,'faheem' UNION ALL
    SELECT 2,'ahmad' UNION ALL
    SELECT 3,'aslam UNION ALL
    SELECT 4,'bilal' UNION ALL
    SELECT 4,'khizar'
DECLARE @vParam VARCHAR(100)
-- To check the values with LIKE operator. These are comma separated.
SET @vParam = 'fah,asl'
-- Used CROSS APPLY to accomplish the task...
SELECT * FROM @vTable
CROSS APPLY (SELECT [item] FROM dbo.fnSplit(@vParam,',')) b
WHERE NAME LIKE '%' + b.[item] + '%'

fnSplit can be created like

CREATE FUNCTION dbo.fnSplit(
    @sInputList VARCHAR(8000) -- List of delimited items
  , @sDelimiter VARCHAR(8000) = ',' -- delimiter that separates items
) RETURNS @List TABLE (item VARCHAR(8000))

BEGIN
DECLARE @sItem VARCHAR(8000)
WHILE CHARINDEX(@sDelimiter,@sInputList,0) <> 0
BEGIN
SELECT
  @sItem=RTRIM(LTRIM(SUBSTRING(@sInputList,1,CHARINDEX(@sDelimiter,@sInputList,0)-1))),
  @sInputList=RTRIM(LTRIM(SUBSTRING(@sInputList,CHARINDEX(@sDelimiter,@sInputList,0)+LEN(@sDelimiter),LEN(@sInputList))))

IF LEN(@sItem) > 0
  INSERT INTO @List SELECT @sItem
END

IF LEN(@sInputList) > 0
INSERT INTO @List SELECT @sInputList -- Put the last item in
RETURN
END
GO

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