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The following query is written to retrieve all those product IDs from the SALES table that have more than 55000 sold and have been ordered more than 10 times: SELECT prod_id FROM sales WHERE quantity_sold > 55000 AND COUNT(*)>10 GROUP BY prod_id HAVING COUNT(*)>10; Which statement is true regarding this SQL statement? Select one:a.It produces an error because COUNT (*) should be specified the SELECT clause also.b.It executes successfully and generates the required result.c.It executes successfully but produces no result because COUNT(prod_id) should be used instead of COUNT(*) .d.It produces an error because COUNT (*) should be only in the HAVING clause and not in the WHERE clause.

Question

The following query is written to retrieve all those product IDs from the SALES table that have more than 55000 sold and have been ordered more than 10 times: SELECT prod_id FROM sales WHERE quantity_sold > 55000 AND COUNT()>10 GROUP BY prod_id HAVING COUNT()>10; Which statement is true regarding this SQL statement? Select one:a.It produces an error because COUNT () should be specified the SELECT clause also.b.It executes successfully and generates the required result.c.It executes successfully but produces no result because COUNT(prod_id) should be used instead of COUNT() .d.It produces an error because COUNT (*) should be only in the HAVING clause and not in the WHERE clause.

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Solution

The correct answer is d. It produces an error because COUNT (*) should be only in the HAVING clause and not in the WHERE clause.

The reason is that the WHERE clause cannot contain aggregate functions like COUNT(). The WHERE clause is processed before the GROUP BY clause, so at the time of processing the WHERE clause, the total count is not yet known. Therefore, the use of COUNT() in the WHERE clause will result in an error. The correct place to use COUNT(*) is in the HAVING clause, which is processed after the GROUP BY clause.

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