May 2017
Beginner
416 pages
10h 37m
English
Content preview from Mastering PostgreSQL 9.6
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Inlining the view
The first transformation done by the optimizer is to inline views. Here is what happens:
SELECT * FROM (SELECT * FROM a, b WHERE aid = bid ) AS v, c WHERE v.aid = c.cid AND cid = 4;
The view is inlined and transformed to a subselect. What does this one buy us? Actually, nothing. All it does is to open the door for further optimization, which will really be a game changer to this query.
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