Thanks for the link Pavel, that makes perfect sense now.
Teddy
From: David G. Johnston
Sent: Thursday, February 16, 2017 12:42:36 PM
To: Teddy Schmitz
Cc: pgsql-general@postgresql.org
Subject: [GENERAL] Problems with Greatest
On Wednesday, February 15, 2017
ows=56027 width=8)
-> Seq Scan on t2 (cost=0.00..808.27 rows=56027 width=8)
It seems it has to do a loop on 14 billion rows? Can someone explain why this
would happen?
Thanks,
Teddy
____
From: Teddy Schmitz
Sent: Thursday, February 16, 2017 12:32:41 PM
To: p
Hello,
I have a query using Greatest that hangs and never returns when called with two
tables.
Postgres Version: 9.6
Tables
t1{ id bigint }
t2 { id bigint }
they are sharing a sequence
the query
select greatest(max(t1.id), max(t2.id)) from t1, t2;
The purpose was to call setval on t
