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compare comma separated values in sql

Anonymous User 2172 16-Jul-2013
HI developers!

I want to write a function for comparing comma separated values that will take two values (comma separated values) after comparison the return value will be true or false

What changes I have to do in this SQL function ?

This function is given below:-

I am trying to write a function to compare comma separated values in SQL I've taken some code from Internet :

SELECT CASE WHEN EXISTS
(
  SELECT 1 FROM dbo.Split(@v1)
  WHERE ', ' + LTRIM(@v2) + ',' 
  LIKE '%, ' + LTRIM(Item) + ',%'
) THEN 1 ELSE 0 END;

Then I make a function :

CREATE FUNCTION [dbo].[fnCompareCSVString]
(  
 
    @str1 nvarchar(50),
    @str2 nvarchar(50)
)
 
RETURNS  int
AS
BEGIN
    SELECT CASE WHEN EXISTS 
    (
       SELECT 1 FROM dbo.Split(@str1)
       WHERE ', ' + LTRIM(@str2) + ',' 
         LIKE '%, ' + LTRIM(Item) + ',%'
    ) THEN 1 ELSE 0 END;
END

I am not good in SQL I know this is wrong

Thanks in advance 

mssql server mssql server 
Updated on 17-Jul-2013
Anonymous User

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1 Answers

shreesh chandra shukla

shreesh chandra shukla

17-Jul-2013
solution!

Is this what you are looking for?

True / False results

-- matches only those values which exist in both CSV sets

SELECT T1.[Item], CASE  WHEN T2.[Item] IS NULL THEN 0 ELSE 1 END AS [Match] 

FROM [dbo].[Split]('val1,val2,val3', ',') AS T1

    LEFT JOIN [dbo].[Split]('val3,val4', ',') AS T2 on T1.[Item] = T2.[Item]

Returns

Item    Match

val1    0

val2    0

val3    1

Only true matches

-- matches only those values which exist in both CSV sets

SELECT T1.[Item] 

FROM [dbo].[Split]('val1,val2,val3', ',') AS T1

    INNER JOIN [dbo].[Split]('val3,val4', ',') AS T2 on T1.[Item] = T2.[Item]

Returns

Item
val3

Split function 

CREATE FUNCTION [dbo].[Split]
(  
 
    @s VARCHAR(max),
    @split CHAR(1)
)
RETURNS @temptable TABLE ([Item] VARCHAR(MAX))    
AS
BEGIN
    DECLARE @x XML
 
    SELECT @x = CONVERT(xml,'<root><s>' + REPLACE(@s,@split,'</s><s>') + '</s></root>');
 
    INSERT INTO @temptable          
    SELECT [Value] = T.c.value('.','varchar(20)')
    FROM @X.nodes('/root/s') T(c);
RETURN
END;

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