NOT LIKE Special chars

hi experts
I have table customer my data contains

NAME
[RER]
RER
[PRE]

I am trying to write a sql which will avoid anything that begins with [
select * from customer where NAME NOT LIKE '[%!]' escape  '!'

Open in new window


doesnt seem to work.
anyhelp will be appreciated
Thanks
royjaydAsked:
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.

Mike EghtebasDatabase and Application DeveloperCommented:
select * from customer where left(NAME, 1)<>'[' or  right(NAME, 1)<>']';
0
royjaydAuthor Commented:
thanks, works
but performance seems to be really slow.
0
Mike EghtebasDatabase and Application DeveloperCommented:
Yes, unfortunately when you include an operation on a field in WHERE clause, it runs it for each row. In your case for 100 records, left() and right() are performed 200 times combined.

I have not been able to come up with some other solution yet.

Mike
0
Cloud Class® Course: Microsoft Exchange Server

The MCTS: Microsoft Exchange Server 2010 certification validates your skills in supporting the maintenance and administration of the Exchange servers in an enterprise environment. Learn everything you need to know with this course.

Nakul VachhrajaniTechnical Architect, Capgemini IndiaCommented:
0
Mike EghtebasDatabase and Application DeveloperCommented:
try:

select * from customer where NAME not like '[%]';
0
Scott PletcherSenior DBACommented:
You have to put the left bracket in brackets:

select *
from customer
where
    NAME NOT LIKE '[[]%'

That leaves NAME "sargable" for best performance.  Do not use LEFT() or SUBSTRING(), as you should always avoid using functions on a column whenever you can.
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
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 SQL Server 2008

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.