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Asked: 2026-05-11T02:59:28+00:00

I have a SQL query that is supposed to pull out a record and

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I have a SQL query that is supposed to pull out a record and concat each to a string, then output that string. The important part of the query is below.

DECLARE @counter int; SET @counter = 1;  DECLARE @tempID varchar(50); SET @tempID = '';  DECLARE @tempCat varchar(255); SET @tempCat = '';  DECLARE @tempCatString varchar(5000); SET @tempCatString = '';  WHILE @counter <= @tempCount BEGIN      SET @tempID = (     SELECT [Val]     FROM #vals     WHERE [ID] = @counter);      SET @tempCat = (SELECT [Description] FROM [Categories] WHERE [ID] = @tempID);     print @tempCat;      SET @tempCatString = @tempCatString + '<br/>' + @tempCat;     SET @counter = @counter + 1;  END

When the script runs, @tempCatString outputs as null while @tempCat always outputs correctly. Is there some reason that concatenation won’t work inside a While loop? That seems wrong, since incrementing @counter works perfectly. So is there something else I’m missing?

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1 Answer

  1. Looks like it should work but for somereason it seems to think @tempCatString is null which is why you are always getting a null value as nullconcatenated to anything else is still null. Suggest you try with COALESCE() on each of the variables to set them to ‘ ‘ if they are null.

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