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POWhy does scalar-value function fail with null parameter?
 

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  1. POWhy does scalar-value function fail with null parameter?
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    <p>In TSQL, I need to do a cross-reference from our value for a given field, to the specified client's value. We have many clients and each client's encoding of values is different. The db is a CRM Dynamics 2011 db.</p> <p>I set up a scalar-valued function like this:</p> <pre><code> [dbo].[fn_GetXRef] (@Guid uniqueidentifier, @LookupType nvarchar(20), @OurValue nvarchar(20), @Parm4 nvarchar(20) = null, @Parm5 uniqueidentifier = null, @Parm6 nvarchar(1) = null, @Parm7 nvarchar(1) = null) </code></pre> <p>Parms 4, 5, 6 and 7 may be null; they are used for some cross-references but not others.</p> <p>If I run execute the logic outside the function , it works. When I execute the function it returns NULL.</p> <p>For example:</p> <pre><code>Select dbo.fn_getXRef('22BF20B1-55F1-E211-BF73-00155D062F00', 'Lookup Type 1', 'Our value', null, null, null, '3') </code></pre> <p>returns null but pulling the logic out of the function and running it as a separate query, and using the same input parameter values, returns the correct client-value.</p> <p>What am I not seeing?</p> <hr> <p>update: 12/11/13</p> <p>Thanks all for trying to help. While researching I found some nifty code that looked more effcient than my own so I re-wrote the function using that technique and now it works. It uses OPTION (RECOMPILE):</p> <p>SELECT @TheirValue = X.carriervalue FROM dbo.Filteredcrossreference X WHERE X.carrier = @CarrierId and X.lookuptype = @LookupType and X.ourvalue = @OurValue and (@Parm4 IS NULL OR (X.parm4 = @Parm4)) and (@Parm5 IS NULL OR (X.parm5 = @Parm5)) and (@Parm6 IS NULL OR (X.parm6 = @Parm6)) OPTION (RECOMPILE)</p>
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    1. USDeveloperM
    1. USDeveloperM
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      1. POWhy does scalar-value function fail with null parameter?
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      1. VTUpMod
    1. COCan you show us the body of the UDF?
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      1. USdazedandconfused
    2. COCan you share (part of) the code for the function `[dbo].[fn_GetXRef]`? Or explain what it is supposed to do?
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      1. USNickyvV
    3. COWhy are you hiding the important part of the function, and only showing us the parameter list? We are not great at mind-reading.
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      1. USAaron Bertrand
 

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