Describe the purpose of the having clause how do you decide, Basic Computer Science

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Describe the purpose of the having clause how do you decide

1. Describe the purpose of the GROUP BY clause. Why must the attribute in the GROUP BY clause also appear in the SELECT clause?

2. Describe the purpose of the HAVING clause. How do you decide whether to place a row-limiting predicate in the WHERE clause or in the HAVING clause?

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Basic Computer Science: Describe the purpose of the having clause how do you decide

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