Query sum of daily maximum

Question

Hi!
I need to query the sum of a daily maximum value but I get an ORA-00936: missing expression with the following query. Why?
select to_char(a.mytimestamp, 'MM/YYYY'),
sum(select max(b.wert) from values b group by trunc(b.mytimestamp))
from values a
group by to_char(a.mytimestamp, 'MM/YYYY')
order by to_char(a.mytimestamp, 'MM/YYYY') desc;
The subselct within sum (select max(b.wert) from values b group by trunc(b.mytimestamp)) works as standalone.
Without the subselect the query works, too!
select to_char(a.zeitstempel, 'MM/YYYY'),
sum(a.wert)
from values a
group by to_char(a.mytimestamp, 'MM/YYYY')
order by to_char(a.mytimestamp, 'MM/YYYY') desc;
Can anybody help?

Answer 1

HI,
something like this
SELECT   to_char(a.mytimestamp, 'MM/YYYY'), (SELECT   sum(max(b.wert))
                                                 FROM values b
                                             GROUP BY trunc(b.mytimestamp))
    FROM values a
GROUP BY to_char(a.mytimestamp, 'MM/YYYY')
ORDER BY to_char(a.mytimestamp, 'MM/YYYY') DESC;edit:
Just to get the syntax right - not sure what you actually want
Regards
Peter
Message was edited by:
Peter Gjelstrup