Checking for NOT NULL condition

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Checking for NOT NULL condition

mcfarlandparkway

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Points: 7699
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January 24, 2017 at 9:34 am

#334411

I have a function where i have to check column not null
if @sen like 'BY%' and @fdd NOT NULL
begin
select bla bla
end
else if @fdd NOT NULL
begin
select bla bla
end
Is the above check and format is correct?

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ScottPletcher SSC Guru Points: 101120 More actions · Answer 1

You must use "IS NOT NULL" rather than just "NOT NULL":

if @sen like 'BY%' and @fdd IS NOT NULL
...

SQL DBA,SQL Server MVP(07, 08, 09) "It's a dog-eat-dog world, and I'm wearing Milk-Bone underwear." "Norm", on "Cheers". Also from "Cheers", from "Carla": "You need to know 3 things about Tortelli men: Tortelli men draw women like flies; Tortelli men treat women like flies; Tortelli men's brains are in their flies".

drew.allen SSC Guru Points: 76996 More actions · Answer 2

And @fdd is a variable, not a column. If you want to check that a column is not null, you'll need to put it in a WHERE (or possibly HAVING) clause of a SELECT/UPDATE/DELETE/INSERT statement.

J. Drew Allen
Business Intelligence Analyst
Philadelphia, PA

ChrisM@Work SSC Guru Points: 186127 More actions · Answer 3

mcfarlandparkway - Tuesday, January 24, 2017 9:34 AM
I have a function where i have to check column not null
if @sen like 'BY%' and @fdd NOT NULL
begin
select bla bla
end
else if @fdd NOT NULL
begin
select bla bla
end
Is the above check and format is correct?

Have you considered using an inline table-valued function rather than a multistatement table-valued function or scalar function?

^{“Write the query the simplest way. If through testing it becomes clear that the performance is inadequate, consider alternative query forms.” - Gail Shaw}

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