You can use two methods:

$query = 'select zipcount from table where id = emailid and address !=
+"" and first != "" group by c.z5' ;
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or escape the quotations

$query = "select zipcount from table where id = emailid and address !=
+\"\" and first != \"\" group by c.z5" ;
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but if it is a SQL select, the server will usually accept this:

$query = "select zipcount from table where id = emailid and address !=
+'' and first != '' group by c.z5";
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Regards,

Peter