Question: 8 . 3 1 . Suggest extensions to the relational calculus so that it may express the following types of operations that were discussed in

8.31. 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.
8.31. Suggest extensions to the relational calculus so that it may

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