indexes multicolumn

From: "Jean-Yves F(dot) Barbier" <12ukwn(at)gmail(dot)com>
To: pgsql-novice(at)postgresql(dot)org
Subject: indexes multicolumn
Date: 2011-05-31 13:18:42
Message-ID: 20110531151842.54532304@anubis.defcon1
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Hi list,

as the doc says:

SELECT name FROM test2 WHERE major = constant AND minor = constant;

then it might be appropriate to define an index on the columns major and minor
together, e.g.:

CREATE INDEX test2_mm_idx ON test2 (major, minor);

I may ask a dumb question, but does the query planner also use such an
index with the inversed query, e.g.:

SELECT name FROM test2 WHERE minor = constant AND major = constant;

or am I obliged to define an inversed index?

JY
--
Everybody is going somewhere!! It's probably a garage sale or a
disaster Movie!!

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