Queries

mmcclaf mmcclaf at gmail.com
Thu Feb 26 17:17:19 CET 2009


Another problem with this assignment... I have to list all the ships
mentioned in the database. All the ships may not appear in the Ships
relations... I said the following in algebraic expression

SELECT name(Ships UNION (SELECT ship (Outcome UNION(SELECT class
(Classes)))

Would that work?



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