Aggregate and Summary tables

Question

Hi guys
I have facts ( FINISHINGPOSITION) having dimensions datedim,JOCKEY_KEY,tracksdim
FINISHINGPOSITION
DATE_KEY
JOCKEY_KEY
TRACKS_KEY
datedim
ACTUALDATE
YEAR
QUARTER
MONTH
WEEK
DAYOFYEAR
DAYOFMONTH
JOCKEY_KEY
JOCKEY_KEY
JOCKEYCODE
JOCKEYNAME
tracksdim
TRACKCODE
TRACKSHORTNAME
TRACKLONGNAME
how can I create summary tables and aggregate table based on these fact and dimensions
Thanks in advance
Vikramjit

Answer 1

Hi,
Where Mustafa used COUNT (*), just use SUM (nbrinparty) instead.
Also, you need to GROUP BY both fltnbr and fltdate, and join by both columns as well.
Since there can be flights with no meals (like fltnbr 003), the join has to be an outer join.
So what you want is something like:
SELECT      f.fltdate
,      f.fltnbr
,      flight_total
,      NVL (meal_total, 0)     AS meal_total
FROM       (
          SELECT        fltdate,  fltnbr
          ,       SUM (nbrinparty)      AS meal_total
          FROM       meals
          GROUP BY  fltdate,  fltnbr
     ) m
          SELECT       fltdate,  fltnbr
          ,       SUM (nbrinparty)      AS flight_total
          FROM       flights
          GROUP BY  fltdate,  fltnbr
     ) f
WHERE     m.fltdate (+)      = f.fltdate
AND     m.fltnbr  (+)     = f.fltnbr;Alternatively, you could do just one sub-query, to get the sum from either one of the tables. In the main query, get the sum from the other table and join, like this:
ITH     got_meal_total     AS
     SELECT        fltdate,  fltnbr
     ,       SUM (nbrinparty)      AS meal_total
     FROM       meals
     GROUP BY  fltdate,  fltnbr
SELECT      f.fltdate
,      f.fltnbr
,      SUM (f.nbrinparty)          AS flight_total
,      NVL (SUM (m.meal_total), 0)     AS meal_total
FROM           flights        f
LEFT OUTER JOIN  got_meal_total      m  ON       f.fltdate     = m.fltdate
                             AND   f.fltnbr     = m.fltnbr
GROUP BY  f.fltdate
,       f.fltnbr
;Edited by: Frank Kulash on Oct 21, 2010 6:52 AM
Added one-sub-query option