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Merge pull request #8 from taikano/patch-2

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left join sufficient
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Martin Thoma 2013-07-30 02:16:31 -07:00
commit 4d1d9c1479
1 changed files with 3 additions and 3 deletions
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6
documents/musterloesung-db-klausur-b/d3d.sql
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@ -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
)