From: Richard Broersma Jr <rabroersma@yahoo.com>
To: roopa perumalraja <roopabenzer@yahoo.com>
To: pgsql-sql@postgresql.org
Subject: Re: Add calculated fields from one table to other table
Date: Thu, 26 Oct 2006 10:59:34 -0700 (PDT)
Message-ID: <20061026175934.78136.qmail@web31806.mail.mud.yahoo.com> (raw)
In-Reply-To: <20061026010736.67473.qmail@web50815.mail.yahoo.com>
> I have two tables. Tick table has fields like ticker, time, price & volume and Timeseries
> table has fields like ticker, time, avg_price, avg_volume.
>
> The time field in Timeseries table is different from time in tick table, its the timeseries
> for every minute. Now I want to calculate the average price & volume from tick table for each
> ticker and for every minute and add those fields to timeseries table. Can anyone please help me
> out with the sql query.
>
> Note: The ticker in the tick table also has duplicate values, so i am not able to create
> relation between two tables.
Here is my guess how it can be done:
insert into Timeseries ( tiker, time, avg_price, avg_volume ) select ...
where select .... would be
select tick,
date_trunc('minute', time) as minute,
avg(price) as avg_price,
avg(volume) as avg_volume
from ticker
where time between 'yourstartdate' and 'yourenddate'
group by tick, minute;
Regards,
Richard Broersma Jr.
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To: pgsql-sql@postgresql.org
Cc: rabroersma@yahoo.com, roopabenzer@yahoo.com
Subject: Re: Add calculated fields from one table to other table
In-Reply-To: <20061026175934.78136.qmail@web31806.mail.mud.yahoo.com>
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