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Is it possible to get MORE results by adding an AND clause to a SQL query?
Posted by: kris helenek
Date: November 05, 2010 10:00AM

For some reason I get more results after I add a superfluous AND clause to the end of a query, which I only tried out of desperation. The more I thought of this, that should never be possible, right? (Unless the and is part of an OR, but that's extending an existing clause, not adding a new one.)

Here's my query:
select l.address_id, d.location_address_id,
from distance d, address a, location l
where member_latitude = 42.4039 and member_longitude = -71.1203 and distance < 25
and location_latitude = a.latitude and location_longitude = a.longitude
and l.address_id = d.location_address_id
#and = l.address_id

If I run that I get 13 results. If I uncomment the last line I get 88. The results either way show that all three values involved are the same! It should be a redundant check right?

Is my database completely corrupt? Or having I been staring at it too long and missed something obvious.

Any help is appreciated, my site is in serious trouble until I fix this.

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