1z0-071 Exam Dumps | Which two tasks require subqueries?

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Question 16/139

Which two tasks require subqueries?

A. Display the total number of products supplied by supplier 102 which have a product status of obsolete.

B. Display suppliers whose PROD_LIST_PRICE is less than 1000.

C. Display the number of products whose PROD_LIST_PRICE is more than the average PROD_LIST_PRICE.

D. Display the minimum PROD_LIST_PRICE for each product status.

E. Display products whose PROD_MIN_PRICE is more than the average PROD_LIST_PRICE of all products, and whose status is orderable.

Correct Answer: C,E

C: True. To display the number of products whose PROD_LIST_PRICE is more than the average PROD_LIST_PRICE, you would need to use a subquery to first calculate the average PROD_LIST_PRICE and then use that result to compare each product's list price to the average.
E: True. Displaying products whose PROD_MIN_PRICE is more than the average PROD_LIST_PRICE of all products and whose status is orderable would require a subquery. The subquery would be used to determine the average PROD_LIST_PRICE, and then this average would be used in the outer query to filter the products accordingly.
Subqueries are necessary when the computation of a value relies on an aggregate or a result that must be obtained separately from the main query, and cannot be derived in a single level of query execution.
References:Oracle's SQL documentation provides guidelines for using subqueries in scenarios where an inner query's result is needed to complete the processing of an outer query.

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