Group by date_part

Hi,

I need to select the amount of orders per day from an order table.

The statement I have only selects the count if there is at least 1 order for
a particular day, which make sense.

I however need a count of 0 for days that don't have any. Can anyone help?

SQL:

SELECT date_part('day', date), count(*)
FROM client_order WHERE (date >= '01/05/01' AND date < '01/06/01') AND
status = 'Processing'
GROUP BY date_part('day', date);