From: | Karl Denninger <karl(at)mcs(dot)net> |
---|---|
To: | hackers(at)postgresql(dot)org |
Subject: | Heh, what's this? |
Date: | 1998-03-09 19:23:54 |
Message-ID: | 19980309132354.23502@mcs.net |
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Thread: | |
Lists: | pgsql-hackers |
The following query returns:
explain update user set inter = person.inter where person.custid = user.custid;
NOTICE: QUERY PLAN:
Nested Loop (cost=1095.16 size=1 width=370)
-> Seq Scan on person (cost=1095.16 size=16035 width=8)
-> Seq Scan on user (cost=0.00 size=0 width=362)
EXPLAIN
Uh, this is a problem.
Both person and user have an index on "custid". 6.2.1 used to utilize them.
You have to do a sequential scan on user, but NOT on person to perform
this update.
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