You just want to do a:
SELECT field1, field2, field3, field4
from tablename
where field1 like '%'&searchvalue & '&'
or field2 like '%'&searchvalue & '&'
or field3 like '%'&searchvalue & '&'
or field4 like '%'&searchvalue & '&'
You might also want to consider using the LOWER function before doing the compares to make sure to ignore cases.
Dave Maxwell
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Proud to be a "World Class" Knucklehead