By the way, if you want to include that "incomplete" week before 12/1
(incomplete because it doesn't have a data point for Monday) then you would
do this:
select s1.asx_code, s1.wdate AS date, s1.low, s1.high, s2.open, s3.close,
s1.volume
from (select asx_code, date_trunc('week', date) AS wdate, min(date) AS
bdate, max(date) AS edate, min(low) AS low, max(high) AS high, SUM(volume)
AS volume
from sales_summaries
group by asx_code, date_trunc('week', date)) s1, sales_summaries s2,
sales_summaries s3
where s1.bdate = s2.date
and s1.asx_code=s2.asx_code
and s1.edate = s3.date
and s1.asx_code=s3.asx_code;
