How to ignore a SQL parameter if it is to be left blank

I have a SQL Stored Proc and I have various parameters I pass into it, including one named @StockNbr.

I have a WHERE condition in the Stored Proc as follows:

WHERE LEFT(stk_nbr,1) IN (SELECT item Common.StrToTable(@StockNbr,100))

How do I modify the Stored Proc to ignore the @StockNbr parameter if I do not wany to pass-in a value for it?

Thanks
Fergal
fjkilkenAsked:
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ProjectChampionConnect With a Mentor Commented:
You can make a parameter in a stored proc optional like this:

Create proc <myproc>
 @p0 <datatype>
, ...
, @StockNbr <datatype> = NULL
, ....

i.e. in the defition part just add "= NULL" after the datatype. After that a caller can call the proc without passing that specific parameter, or include it and explicitly pass NULL value, which will have the same effect. Inside the proc, you can check If "@StockNbr = NULL" and wither replace it with a default value of your choice or change the logic by branching to another path that doesn't need/rely on the @StockNbr.
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GanapathiFacets DeveloperCommented:
You can pass the value as NULL. Or default the value to NULL while creating the procedure.

Use the below code.

WHERE
   1 = (CASE
           WHEN @StockNbr IS NULL
              THEN 1
           ELSE 2
        END)
  OR LEFT(stk_nbr,1) IN (SELECT item Common.StrToTable(@StockNbr,100))

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If you pass a valid value for @StockNbr, then it will use it. else it will ignore the where and fetch all the data from the Table.
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Vikas GargBusiness Intelligence DeveloperCommented:
Hi,

You can modify the SP by providing default value to the Parameter in the stored procedure where the Parameter has bee mentioned in the SP.
for example
ALTER PROCEDURE [abc]
      
      @StockNbr varcahr(30) = '1,2'

By doing this you can Execute the SP Without passing the parameter but since the SP contains Where clause the Value in the Parameter set default will affect the result.
And if the where clause is not required you can also comment that portion
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GanapathiFacets DeveloperCommented:
The solution that I gave will not have redundant code. Isn't a good one?
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fjkilkenAuthor Commented:
I'm afraid the solution provided by Project Champion was the first and most intuitive one for me to use, thus the reason why I accepted it.
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GanapathiFacets DeveloperCommented:
That's fine. You are the asker :)
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