| From: | Diego Augusto Molina <diegoaugustomolina(at)gmail(dot)com> |
|---|---|
| To: | Alban Hertroys <haramrae(at)gmail(dot)com> |
| Cc: | koen(dot)vanimpe(at)belnet(dot)be, pgsql-general(at)postgresql(dot)org |
| Subject: | Re: Grouping by timestamp, how to return 0 when there's no record |
| Date: | 2011-09-19 12:08:27 |
| Message-ID: | CAGOxLdFcpcy4XTezuGXw7gnPf95UY4pqJhVC5BdD11E6aifrfQ@mail.gmail.com |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-general |
Hi, this may be a start:
-- This will make our day better :)
with base_query (tstmp) as (
select DATE_TRUNC('hour',timestamp) as tstmp
FROM record
WHERE
record.timestamp BETWEEN ( CURRENT_TIMESTAMP + INTERVAL '-7 day') and
(CURRENT_TIMESTAMP) -- this I don't understand
)
-- The following will make the same as your query
select count(*) as qt, tstmp as dfilter from base_query
-- And this adds the zero's
union
select 0 as qt, min(tstmp) + interval generate_series( 0, max(tstmp) -
min(tstmp) ) || ' hours' as dfilter
from base_query
where dfilter not in tstmp; -- Only for those who don't!
Don't forget to tell us how you ended up!
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| Next Message | Henry Drexler | 2011-09-19 13:10:20 | General guidance if there is an in dadabase solution or should stay as excel vba solution. |
| Previous Message | Alban Hertroys | 2011-09-19 11:55:42 | Re: Grouping by timestamp, how to return 0 when there's no record |