Does PostgreSQL optimizer handle iceberg queries well?
What do you mean by iceberg query ?
I've never heard this term.
Regards, Christoph
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Sent: Tuesday, February 04, 2003 3:39 AM
Subject: Re: [SQL] iceberg queries
Does PostgreSQL optimizer handle iceberg queries well?
What do you mean by iceberg query ?
I've never heard this term.
Regards, Christoph
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TIP 4
On Tue, Feb 04, 2003 at 09:08:56 -0500,
Wei Weng [EMAIL PROTECTED] wrote:
It is a query that looks like
SELECT target1, target2... targetn, SUN(t.qty)
FROM Table t
GROUP BY target1
HAVING SUM(t.qty)=10
You can replace SUM(t.qty)=10 with other aggregate constraints.
There were some
Christoph Haller wrote:
Does PostgreSQL optimizer handle iceberg queries well?
What do you mean by iceberg query ?
I've never heard this term.
Iceberg queries compute one or more aggregate functions to find
aggregate values above a specified threshold. A typical iceberg query
would be
Jan Wieck [EMAIL PROTECTED] writes:
As to the original question, if an index is available that returns the
rows in the sort order of the GROUP BY clause, PostgreSQL defaults to an
index scan, otherwise it will do a sort of the rows matching an optional
WHERE clause. This sorted set is then
Tom Lane wrote:
Jan Wieck [EMAIL PROTECTED] writes:
As to the original question, if an index is available that returns the
rows in the sort order of the GROUP BY clause, PostgreSQL defaults to an
index scan, otherwise it will do a sort of the rows matching an optional
WHERE clause. This
Does PostgreSQL optimizer handle iceberg queries well?
Thanks
Wei
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