Hi,
I have a simple table
price(id_product, price, date)
which records price changes for each id_product. Each time a price
changes a new tuple is created.
What is the best way to select only the latest price of each id_product?
Thanks,
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2009/9/22 Louis-David Mitterrand vindex+lists-pgsql-...@apartia.org:
Hi,
I have a simple table
price(id_product, price, date)
which records price changes for each id_product. Each time a price
changes a new tuple is created.
What is the best way to select only the latest price of
On Tue, Sep 22, 2009 at 11:56:54AM +0200, Pavel Stehule wrote:
there are more ways - depends on what you wont.
one way is
SELECT *
FROM price
WHERE (id_product, date) = (SELECT id_product, max(date)
FROM price
In response to Louis-David Mitterrand :
Hi,
I have a simple table
price(id_product, price, date)
which records price changes for each id_product. Each time a price
changes a new tuple is created.
What is the best way to select only the latest price of each id_product?
There are
Let's say there's an index on the date column: Does the where clause
approach necessarily out perform the distinct on version? Hoping the OP
has enough data to make analyse useful.
A. Kretschmer wrote:
In response to Louis-David Mitterrand :
Hi,
I have a simple table
price(id_product,
Dear Postgres Gurus;
I've just diagnosed a PostgreSQL 8.3.4 server which, about once a month, would
deadlock shortly after 11pm. It had been doing this for years,
and the prior response was simply to reboot everything. The culprit boils down
to:
# create table cache_table_20090921 (
site_key
Dear Postgres Gurus;
I've just diagnosed a PostgreSQL 8.3.4 server which, about once a month,
would deadlock shortly after 11pm. It had been doing this for years,
and the prior response was simply to reboot everything. The culprit
boils down to:
# create table cache_table_20090921 (
site_key
Bryce Nesbitt bry...@obviously.com writes:
1) Why the AccessExclusiveLock on create table?
It has to install a trigger on the referenced table. There has been
some discussion that maybe CREATE TRIGGER could take just ExclusiveLock
and not AccessExclusiveLock, but it hasn't been done yet; and
Tom Lane wrote:
Bryce Nesbitt bry...@obviously.com writes:
1) Why the AccessExclusiveLock on create table?
It has to install a trigger on the referenced table. There has been
some discussion that maybe CREATE TRIGGER could take just ExclusiveLock
and not
Hello to all,
Being in a pretty much international company, I have come here to ask a few
things about ETL tools and their different languages.
We have offices in the US, in Europe (Italy, France) and in China. We think
English is fine but our European team and Chinese team especially would
Are you asking that all strings be stored into the other three languages
as part of (potentially many-master) replication?
hfdabler wrote:
Hello to all,
Being in a pretty much international company, I have come here to ask a few
things about ETL tools and their different languages.
We
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