I am searching across two joined tables and am interested in a few
parameters:

SELECT a.first a.third b.first FROM a JOIN b ON a.RowID = b.RowID WHERE
value = :value 

Is there any speed or memory performance improvement by using SELECT *,
rather than SELECT <specific columns> ? 

If I know there will only be one item (unique :value) selected (LIMIT 1) can
I make any performance improvements ?
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