AVG, SUM, GROUP BY -> Abfrage?

[Rouven]

Korrektur:

SELECT AVG(summenzug) AS d
FROM
  SELECT SUM(dauer) AS d
  FROM spiele
  GROUP BY matchid

Muss natürlich heißen
 SELECT AVG(summenzug) AS d
 FROM
   SELECT SUM(dauer) AS summenzug
   FROM spiele
   GROUP BY matchid

MfG
Rouven