>>> On Thu, Sep 13, 2007 at  7:30 AM, in message
<[EMAIL PROTECTED]>, "W.Alphonse
HAROUNY" <[EMAIL PROTECTED]> wrote: 

>    and each binary value of [variableCategory] may only hold a single binary
> '1'.

>  TBL1.CATEGORY & TBL2.CATEGORY <> 0  //-- where & is the AND bitwise
> operator

What about saying?:
 
  TBL1.CATEGORY = TBL2.CATEGORY
 
If your indexes include this and the other columns which cause the tables
to be related, one or both of them stand a pretty good chance of evaluating
to the lowest-cost method to join the tables.  Forcing a query to use an
index outside of it being the cheapest path is rarely productive.
 
-Kevin


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