On Jun 18, 2007, at 10:17 , Michael Glaesemann wrote:
> Looking over your function, I'm a little confused about what you're
> trying to do. I'm guessing the (final) result you're trying to get
> is the number of hours lost for each product per area per month for
> the three years prior to the provided date.
Or, rather, the number of hours lost per production area per month
for the three years prior to the provided date.
> SELECT date_trunc('month', production.production_date)::date
> AS production_period
> , product.id_production_area
> , sum(production_hours) as total_production_hours
> FROM production
> JOIN product USING (id_product)
> WHERE lost_hours = 'S'
> AND date_trunc('month', a.production_date)::date BETWEEN
> date_trunc('month', ? - 3 * interval '1 year')::date
> AND date_trunc('month', ?)::date;
Looks like I forgot the GROUP BY clause:
GROUP BY production_period, id_production_area
Michael Glaesemann
grzm seespotcode net
