1z0-071 Exam Dumps | Table EMPLOYEES contains columns including EMPLOYEE_ID, JOB_ID and SALARY. Only the EMPLOYEES

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Question 80/144

Table EMPLOYEES contains columns including EMPLOYEE_ID, JOB_ID and SALARY.
Only the EMPLOYEES_ID column is indexed.
Rows exist for employees 100 and 200.
Examine this statement:
UPDATE employees
SET (job_id, salary) =
(SELECT job_id, salary
FROM employees
WHERE employee_id = 200)
WHERE employee id=100;
Which two statements are true?

A. Employees 100 and 200 will have the same SALARY as before the update command.

B. Employee 100 will have SALARY set to the same value as the SALARY of employee 200.

C. Employee 100 will have JOB_ID set to the same value as the JOB_ID of employee 200.

D. Employees 100 and 200 will have the same JOB ID as before the update command.

E. Employee 200 will have SALARY set to the same value as the SALARY of employee 100.

F. Employee 200 will have JOB_ID set to the same value as the JOB_ID of employee 100

Correct Answer: B,C

The SQL UPDATE statement is used to modify existing records in a table. In the given statement, there is a subquery that selects the JOB_ID and SALARY of EMPLOYEE_ID 200 and sets these values to the corresponding columns of EMPLOYEE_ID 100.
B . Employee 100 will have SALARY set to the same value as the SALARY of employee 200: This is true because the subquery selects the SALARY of employee 200 and the outer update statement sets this SALARY to employee 100.
C . Employee 100 will have JOB_ID set to the same value as the JOB_ID of employee 200: Similarly, the JOB_ID for employee 100 is updated to match the JOB_ID of employee 200 because of the subquery.
Reference:
Oracle Database SQL Language Reference 12c, particularly the section on the UPDATE statement and subqueries.

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