Problems about SQL (conversion to a form that Oracle can understand)

Question

how can I convert this SQL into a form that Oracle can understand??
Select Temp.Country_name, number1
from (Select L.CID, C.country_name, count(*) as number from Leagues L, Countries C
where L.cid = C.cid and L.season = 'Autumn'
Group By L.CID, C.country_name) AS Temp
where number1 = (Select MAX(Temp. number1) from Temp)
ORDER BY Temp.Country ASC;
this query is to find the country that held the maximum number of leagues in "Autumn". Display the country_name and number. Sort the result according to country_name in alphabetical order and it should be allowed in SQL/92.
relational schema of Leagues ( LID(PRIMARY KEY), LEAGUE NAME, CHAMPION_TID, YEAR, SEASON, CID)
COUNTRIES (CID, COUNTRY_NAME, FOOTBALL_RANKING)
Thank You.

Answer 1

Hi,
Welcome to the forum!
Sorry, I don't know what's allowed in SQL/92.
This works in Oracle 9 (and up) and doesn't rely on anything that I know is an Oracle-specific feature:
WITH       country_summary     AS
     SELECT       c.country_name
     ,       COUNT (*)          AS country_total
     FROM       leagues     l
     JOIN       countries     c     ON     c.cid     = l.cid
     WHERE       l.season     = 'Autumn'
     GROUP BY  c.country_name
--     ,            c.cid          -- needed only if country_name is not unique
SELECT     *
FROM     country_summary
WHERE     cnt     = (
                SELECT  MAX (cnt)
                FROM    country_summary
;Here's another way, which works in Oracle 8.1 (and up):
SELECT  *
FROM     (
          SELECT       c.country_name
          ,       COUNT (*)                         AS country_total
          ,       RANK () OVER (ORDER BY COUNT (*) DESC)     AS rnk
          FROM       leagues     l
          ,       countries     c
          WHERE       c.cid          = l.cid
          AND       l.season     = 'Autumn'
          GROUP BY  c.country_name
     --     ,            c.cid          -- needed only if country_name is not unique
WHERE     rnk     = 1
;By the way, do you find it easier to read and understand code when it's formatted like the examples above, or as you posted it?
Help the people who want to help you. Always format your code. When posting any formatted text on this site, type these 6 characters:
\(small letters only, inside curly brackets) before and after each section of formatted text, to preserve spacing.
Edited by: Frank Kulash on Nov 4, 2010 10:35 AM
Revised 2nd option, because Oracle 8.1 can't use ANSI join syntax.