Re: Analysis Function

On 11/06/10 23:38, David Jarvis wrote:
> I added an explicit cast in the SQL:
>
>          dateserial(extract(YEAR FROM
> m.taken)::int,'||p_month1||','||p_day1||') d1,
>          dateserial(extract(YEAR FROM
> m.taken)::int,'||p_month2||','||p_day2||') d2
>
> The function now takes three integer parameters; there was no performance
> loss.

We had a little chat about this with Magnus. It's pretty surprising that
there's no built-in function to do this, we should consider adding one.

We could have a function like:

construct_timestamp(year int4, month int4, date int4, hour int4, minute
int4, second int4, milliseconds int4, timezone text)

Now that we have named parameter notation, callers can use it to
conveniently fill in only the fields needed:

SELECT construct_timestamp(year := 1999, month := 10, date := 22);

--
   Heikki Linnakangas
   EnterpriseDB   http://www.enterprisedb.com