Quotes in query

[eluser]ivantcholakov[/eluser]
This is what you know, I can't tell. Where does the list of zip-codes come from? From the database, from a text file, from a PHP hard-coded array/string? Who makes/updates this list? And in time this situation may change.

Nevertheless, in all cases I would prefer the query builder, if it is able to do the job. It is a safer approach. And it has additional benefits: cleaner code, abstraction from the database server type.