1z1-909 Exam Dumps | Examine the appointments table definition which contains one million rows: (Exhibit) Now, examine this

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Question 12/28

Examine the appointments table definition which contains one million rows:

Now, examine this statement which executes successfully:

Which statement will improve query performance?

A. ALTER TABLE appointments add index IX_1(credit,payment)

B. ALTER TABLE appointments add index IX_2(attendant_session_id, created_by)

C. ALTER TABLE appointments add index IX_4<attendant_id, payment, credit)

D. ALTER TABLE appointments add index IX_3(attendant_id, created_by)

Correct Answer: C

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