Hello,
I'm trying to write a query that groups records by hour.
This works fine but when there are no records for a specific hour the
query does not return a result (this seems 'logic') and I'd like it to
return '0'. I suspect I should play around with 'interval' or something
but I can't get it to work.
I'd like to see a resultset similar to this
20 | 2011-09-12 12:00:00
7 | 2011-09-12 13:00:00
0 | 2011-09-12 14:00:00
14 | 2011-09-12 15:00:00
The current query is
SELECT COUNT(*) AS qt, DATE_TRUNC('hour',timestamp) as dfilter FROM
record WHERE record.timestamp BETWEEN (CURRENT_TIMESTAMP + INTERVAL '-7
day') and (CURRENT_TIMESTAMP) GROUP BY dfilter ORDER BY dfilter
Any help is highly appreciated.
kr,
koen
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