From: pgsql-sql-owner@postgresql.org [mailto:pgsql-sql-owner@postgresql.org] On Behalf Of JORGE MALDONADO Sent: Saturday, December 29, 2012 2:06 PM To: pgsql-sql@postgresql.org Subject: [SQL] Query execution based on a condition
I have a query similar to the one shown below but, depending on the value of a field, only the first SELECT statement shoud execute and the other 3 should be ignored. Is there a way to achieve this situation?
SELECT fields FROM tblTable WHERE condition
UNION
SELECT fields FROM tblTable WHERE condition
UNION
SELECT fields FROM tblTable WHERE condition
UNION
SELECT fields FROM tblTable WHERE condition
Respectfully,
Jorge Maldonado
Not using pure SQL. pl/pgsql provides you access to conditionals and flow control so you should be able to create a function to do precisely what you need.