DataSource Controls :: Not Getting The Expect Result Set From Query / Join Or Union?

i have a form that my i use to look up whether or not there is an email address in the database. i wrote a query with this basic structure:

select *

from table A, table B

where table A.email = "email" or table b = "email"

i though that would return all instances that the email occurred in either table. what i am getting back is a bunch of null or other unrelated records from table A with a matching email in table B. the thing is, these two tables primary key to join them. i thought i wouldnt need to do that though in this case.

here is the actually query i am using if it makes things more clear:

select lm.cemailaddr, lm.b1emailadd, b.emailaddr