Suggest extensions to the relational calculus so that it may express the following types of operations that
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Suggest extensions to the relational calculus so that it may express the following types of operations that were discussed in Section 8.4:
(a) Aggregate functions and grouping;
(b) OUTER JOIN operations;
(c) Recursive closure queries.
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Related Book For 
Fundamentals Of Database Systems
ISBN: 9780133970777
7th Edition
Authors: Ramez Elmasri, Shamkant Navathe
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