MYsql Query using not like

I have a query and it doesn't work very well

I have put in a not like statement in the query and my thinking is that the query would catch everything including the null values for the field except it doesn't.  If the field is empty it doesn't catch the record.

The query is

SELECT (DATE_FORMAT(Posted, '%Y%m01')) as YM, Count(INum) AS ICount, AVG(Sub) AS Average, Sum(Sub) AS SubTotal, Store, Emp FROM main WHERE (Cdate between 20110331 AND 20120331) AND ANumber like '%cash%' and Status not like 'Credit%' group by Store, Emp, YM
Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

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.


and (Status not like 'Credit%' or Status is null)

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
Do you get an error?
To the suggestion johanntagle made, I'd suggest the change in the order, first check whether it is null thus preventing the not like check on nulls.
@arnold - good point.

Btw, @ralphs1961, see for an explanation why you specifically need to test for nulls.
Acronis True Image 2019 just released!

Create a reliable backup. Make sure you always have dependable copies of your data so you can restore your entire system or individual files.

ralphs1961Author Commented:
johanntagle answer seems to work I am just going to check it and make sure that it works.  It sure seems and gives me what I am looking for.  My question is why does it work?  I have made queries before that haven't worked because of this as well.
not like '<pattern>%' likely matches something you did not think it will match.
reverse the condition and see the data that is being returned.
My question is why does it work?  I have made queries before that haven't worked because of this as well.

The link I gave you above gives you the explanation.  Basically using NOT LIKE on a NULL will always return NULL.  What you need is something that will evaluate to TRUE in order for the row in question to be part of the result set.  So checking if the value of Status for that row is null does the trick.
ralphs1961Author Commented:
Hey guys, I double checked the query and made my own calculations on the actual rows that were returned as well with and without the clause.  AWESOME thanks hugely for your  help.
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
MySQL Server

From novice to tech pro — start learning today.