Re: Query information needed

On Thu, 2005-10-13 at 05:50 -0700, djzanky(at)gmail(dot)com wrote:
> Dear all,
>
> I have a table created with this specifications:
>
> CREATE TABLE cdr (
> calldate timestamp with time zone NOT NULL default now(),
> clid varchar(80) NOT NULL default '',
> src varchar(80) NOT NULL default '',
> dst varchar(80) NOT NULL default '',
> dcontext varchar(80) NOT NULL default '',
> channel varchar(80) NOT NULL default '',
> dstchannel varchar(80) NOT NULL default '',
> lastapp varchar(80) NOT NULL default '',
> lastdata varchar(80) NOT NULL default '',
> duration bigint NOT NULL default '0',
> billsec bigint NOT NULL default '0',
> disposition varchar(45) NOT NULL default '',
> amaflags bigint NOT NULL default '0',
> accountcode varchar(20) NOT NULL default '',
> uniqueid varchar(32) NOT NULL default '',
> userfield varchar(255) NOT NULL default ''
> );
>
> I want to extract the number of calls placed in 1 hour and the average
> call duration
>
> I'm working with this query:
>
> SELECT date_trunc('hour',calldate), duration FROM cdr WHERE src=601
> ORDER BY calldate;
>
> i tried several other queries but i'm not able to count the number of
> calls in an hour (better in a time interval) and calculate the average
> duration.

For any particular interval:

SELECT COUNT(*), AVG(duration)
FROM cdr
WHERE src='601' AND
calldate BETWEEN CAST ('2005-10-17 10:00:00' AS TIMESTAMP WITH TIMEZONE) AND
CAST ('2005-10-17 10:59:59' AS TIMESTAMP WITH TIMEZONE);

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Oliver Elphick olly(at)lfix(dot)co(dot)uk
Isle of Wight http://www.lfix.co.uk/oliver
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