I have a stored procedure (SS2k8) with a couple table-valued parameters that will sometimes be null or empty. I have seen this StackOverflow post that says that null/empty TVPs should simply be omitted from the calling parameter list. My problem is that I can't figure out how to check for empty or null inside the stored procedure as "IF (@tvp IS NULL)" fails on procedure creation with the message 'Must declare the scalar variable "@tvp"'. Do I have to do a SELECT COUNT(*) on the TVP and check for zero?
Code excerpt:
CREATE PROCEDURE [foo] (@tvp [TvpType] READONLY) AS
IF (@tvp IS NOT NULL) -- doesn't work
BEGIN
-- lots of expensive processing
END
ELSE
BEGIN
-- a little bit of cheap processing
END
...
Best Answer
A table can't be
NULL
, nor can a TVP. How do you check if a table is empty? You certainly don't sayIF Sales.SalesOrderHeader IS NULL
. :-)