MS Access Query - Help with <> in query

I have data that looks like this (simplified):

ID, Category
1,AB
2,CD
3,       <-- Blank or Null
4,EF
5,GH
6,AB
... 

Open in new window


When I try to filter out "GH" the query is also ignoring the Blank or Null rows. Here is the query:
SELECT ID, CATAGORY
FROM TestTable
WHERE CATAGORY <> "GH";

Open in new window


I have also tried this with the same results:
SELECT ID, CATAGORY
FROM TestTable
WHERE Not(CATAGORY = "GH");

Open in new window


I am at a loss why the results include all Categories except for "GH" (expected) and blank or null rows. This is omitting several thousand records that should be part of the results.
ckelsoeAsked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

chaauCommented:
It is a "normal" behaviour that applies to most databases. I could not find any "official" source from MSDN that is applicable to MS Access, here is a technical note applicable to SQL Server
There are two ways to fix this:
You can use a Nz function, like this:
SELECT ID, CATAGORY
FROM TestTable
WHERE Nz(CATAGORY, "") <> "GH";

Open in new window

Or you can add a condition for IsNull()
SELECT ID, CATAGORY
FROM TestTable
WHERE CATAGORY <> "GH" Or IsNull(CATEGORY);

Open in new window

0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
ckelsoeAuthor Commented:
Thanks - I forgot that. Query works as intended now.
0
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Microsoft Access

From novice to tech pro — start learning today.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.