Avoid records with underscore

Hi experts,

I need to perform a mysql query to retrieve all records that not contains an underscore into a string.
So 12345 should be taken ; 12345_blue should be rejected.

I use the following query but it is to much time consumming (due to the use of LIKE)
select jcId from jcstktabl where jcid not like '%\_%'

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I would like to replace this with a version without like clause, for performance concern.

EDIT : I know using like with a leadind joker is bad, but I don't find another way :(

Thanks a lot
adam1hAsked:
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HainKurtSr. System AnalystCommented:
try

INSTR(jcid, '_')=0

or this one...

LOCATE(jcid, '_')=0
0

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