I have a stored procedure which accepts two parameters of type UniqueIdentifier When I

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Asked: May 25, 20262026-05-25T14:54:52+00:00 2026-05-25T14:54:52+00:00

I have a stored procedure which accepts two parameters of type UniqueIdentifier

When I call this sproc with an explicit call to NewId() in place of one of the arguments:

exec dbo.TestArgs newid, '34131101-04DE-4B97-8FAC-49C924F7BFCE'

it fails with:

Error converting data type nvarchar to uniqueidentifier.

But passing a variable populated by NewId() into the call is fine:

DECLARE @painInTheArse UniqueIdentifier
SET @painInTheArse = NewID()

EXEC dbo.TestArgs~~newid~~@painInTheArse,'34131101-04DE-4B97-8FAC-49C924F7BFCE'

works perfectly

To me this just seems very wrong. Can someone please explain?

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Editorial Team · Answer 1 · 2026-05-25T14:54:52+00:00

Editorial Team

Parameters passed into stored procs have to be constants. See this question.

Your solution of putting the result of the function call into a parameter first is absolutely correct…

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