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* Time interval sums
@ 2006-10-02 20:58 A. R. Van Hook <hook@lake-lotawana.mo.us>
2006-10-02 21:29 ` Re: Time interval sums Tom Lane <tgl@sss.pgh.pa.us>
0 siblings, 1 reply; 2+ messages in thread
From: A. R. Van Hook @ 2006-10-02 20:58 UTC (permalink / raw)
To: pgsql-sql
How does one sum interval sums?
the following does not work:
select sum(stop-start::interval) as total from startstop
where sid = 545 and
2006 = date_part('year', day) and
9 = date_part('month', day)
however select stop-start::interval) as total from startstop
where sid = 545 and
2006 = date_part('year', day) and
9 = date_part('month', day)
works great but I need an overall sum
Table schema:
Table "public.startstop"
Column | Type | Modifiers
--------+------------------------+-----------
sid | integer | not null
start | time without time zone |
stop | time without time zone |
day | date | not null
thanks
--
Arthur R. Van Hook
Mayor
The City of Lake Lotawana
hook@lake-lotawana.mo.us
(816) 578-4704 - Home
(816) 578-4215 - City
(816) 564-0769 - Cell
^ permalink raw reply [nested|flat] 2+ messages in thread
* Re: Time interval sums
2006-10-02 20:58 Time interval sums A. R. Van Hook <hook@lake-lotawana.mo.us>
@ 2006-10-02 21:29 ` Tom Lane <tgl@sss.pgh.pa.us>
0 siblings, 0 replies; 2+ messages in thread
From: Tom Lane @ 2006-10-02 21:29 UTC (permalink / raw)
To: A. R. Van Hook <hook@lake-lotawana.mo.us>; +Cc: pgsql-sql
"A. R. Van Hook" <hook@lake-lotawana.mo.us> writes:
> How does one sum interval sums?
> the following does not work:
> select sum(stop-start::interval) as total from startstop
Define "does not work"? What did you get, what were you hoping for?
Personally I'd drop the unnecessary cast, but AFAICS there are
appropriate operators at least as far back as 7.3.
regards, tom lane
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2006-10-02 20:58 Time interval sums A. R. Van Hook <hook@lake-lotawana.mo.us>
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