>> I've got data in a table containing timestamps in a timestamp column. I
>> want to group these by month.
>>
>> How?
>>
>> Anything simpler/better than this:
>> substring(cast(T."TheTimestamp" as varchar(50)) from 1 for 7)
>
>select
> count(*)
> , extract(month from mytimestamp)
>from
> t
>group by
> extract(month from mytimestamp)

Or, if you don't want to group November 2010 with November 2011:

select count(*)
, extract(year from mytimestamp) || '-' ||
extract(month from mytimestamp) as MyMonth
from t
group by 2, 3

HTH,
Set