Question: 1- What is the rationale behind data grouping? 2- Can the WHERE and HAVING clauses be combined in a single query? Illustrate with an example.

1- What is the rationale behind data grouping?

2- Can the WHERE and HAVING clauses be combined in a single query? Illustrate with an example.

3- Why summarized information is needed for calculated attributes? Explain using as an example an invoice of a monthly sales report.

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