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LaTeX-examples/documents/musterloesung-db-2012-09-24/d2c1.sql
2013-07-30 12:52:22 +02:00

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SQL

SELECT f1.person2, f2.person2
FROM FriendshipSymmetric f1
JOIN FriendshipSymmetric f2
ON f1.person1 = f2.person1
LEFT JOIN FriendshipSymmetric f3
ON f1.person2 = f3.person1 AND f2.person2 = f3.person2
WHERE f1.person2 != f2.person2
AND f1.person1 = <id>
AND p3.person1 IS NULL
AND p3.person2 IS NULL