Null case with concatenation

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Null case with concatenation



I have the below situation in my project:



@num1 is an integer
1. when @num1 = null/' ' then output should be space(0)
2. else if it is single digit, concatenate with '0' in the front. If double digit, show as it is.



Example:


1. @num1 = null/'' output: space(0)
2. @num1 = '0' output:00
3. @num1 = '9' output:09
4. @num1 = '11' output = 11



My code:


declare @num1 int = null
select @num1,
CASE
WHEN cast(@num1 as varchar) = null THEN space(0)
ELSE RIGHT(CONCAT('00', CONVERT(VARCHAR,@num1)),2)
END as 'output'



This code works fine for examples 2,3,4. But when I set @num1 = null, the output still shows as '00'. desired output should be space(0)/space. Missing some conversion here. Any help?









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