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The operation which is not considered a basic operation of relational algebra is

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The operation which is not considered a basic operation of relational algebra is

(a) Join

(b) Selection

(c) Union

(d) Cross product

I got this question in homework.

This is a very interesting question from Join Expressions in section SQL : Queries, Constraints and Triggers of Database Management

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Best answer
Right choice is (a) Join

To explain: None.

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