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Recommendation for writing a select statement. - Mailing list pgsql-novice

From JORGE MALDONADO
Subject Recommendation for writing a select statement.
Date
Msg-id BANLkTimKKMmN9Mpm09vspE24PvMwVNtH7A@mail.gmail.com
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I need to design a query statement and this is the general structure of what I have in mind:
 
SELECT STATEMENT
(EXCEPT
(SELECT STATEMENT))
UNION
SELECT STATEMENT
(EXCEPT
(SELECT STATEMENT))
 
Is this a recommended guideline or should I break it into smaller individual and independent pieces?
 
Respectfully,
Jorge Maldonado

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