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CS411 Database Systems

CS411 Database Systems. Kazuhiro Minami. 06: SQL. Quiz: T/F questions. Subclasses in E/R model have key attributes. In Relational algebra, natural join is one of the five basic operations. A relation in the relational model may have multiple keys.

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CS411 Database Systems

CS411 Database Systems. Kazuhiro Minami. 06: SQL. Join Expressions. Join Expressions. SQL provides a number of expression forms that act like varieties of join in relational algebra. But using bag semantics, not set semantics.

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