Merge pull request #8 from taikano/patch-2

left join sufficient

documents/musterloesung-db-klausur-b/d3d.sql

@@ -1,6 +1,6 @@
 CREATE VIEW Beratungsanzahl AS (
-    SELECT berater_id, count(DISTINCT Berater.berater_id) AS Anzahl
-    FROM Berater
-    FULL OUTER JOIN Kunden ON Berater.berater_id = Kunden.berater_id
+    SELECT berater_id, COUNT(kb.kunden_id) AS anzahl
+    FROM Berater b
+    LEFT OUTER JOIN Kunden2Berater kb ON b.berater_id = kb.berater_id
     GROUP BY berater_id
 )