1z0-071 Exam Dumps | Which statements is true about using functions in WHERE and HAVING?

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Question 57/144

Which statements is true about using functions in WHERE and HAVING?

A. using single-row functions in the WHERE clause requires a subquery

B. using single-row functions in the HAVING clause requires a subquery

C. using aggregate functions in the WHERE clause requires a subquery

D. using aggregate functions in the HAVING clause requires a subquery

E. False. Aggregate functions are intended to be used in the HAVING clause, which is specifically for filtering groups of rows after they have been aggregated, and they do not require a subquery to be used there.

Correct Answer: C

Single-row functions can be used in the WHERE and HAVING clauses without requiring a subquery. However, aggregate functions, which operate on many rows to give one result per group, cannot be used in a WHERE clause unless a subquery is used because the WHERE clause is processed before the individual rows are aggregated into groups.
A : False. Single-row functions can be directly used in the WHERE clause.
B : False. Single-row functions can be directly used in the HAVING clause.
C : True. Aggregate functions cannot be used in the WHERE clause without a subquery because the WHERE clause filters individual rows before they are aggregated.
Reference:
Oracle Documentation on WHERE Clause: https://docs.oracle.com/database/121/SQLRF/queries003.htm#SQLRF52357 Oracle Documentation on HAVING Clause: https://docs.oracle.com/database/121/SQLRF/statements_10002.htm#SQLRF01702

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