1z0-071 Exam Dumps | Examine this SQL statement: DELETE FROM employees e WHERE EXISTS (SELECT'dummy' FROM emp

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Question 72/156

Examine this SQL statement:
DELETE FROM employees e
WHERE EXISTS
(SELECT'dummy'
FROM emp_history
WHERE employee_id = e.employee_id)
Which two are true?

A. The subquery is executed for every row in the EMPLOYEES table.

B. The subquery is not a correlated subquery.

C. The subquery is executed before the DELETE statement is executed.

D. All existing rows in the EMPLOYEE table are deleted.

E. The DELETE statement executes successfully even if the subquery selects multiple rows.

Correct Answer: A,E

The provided DELETE statement uses a correlated subquery to determine which rows should be deleted from the EMPLOYEES table.
* A. The subquery is indeed executed for every row in the EMPLOYEES table. This is because it references e.employee_id, which is a column from the outer query, making it a correlated subquery.
* B. The subquery is a correlated subquery, as explained above.
* C. The subquery is executed for each row, not before the DELETE statement.
* D. Not all existing rows in the EMPLOYEES table are deleted, only those that have a corresponding employee_id in the EMP_HISTORY table.
* E. The DELETE statement executes successfully even if the subquery selects multiple rows because the EXISTS condition only checks for the presence of rows, not their count.
References:
* Oracle Database SQL Language Reference 12c Release 1 (12.1), DELETE Statement
* Oracle Database SQL Language Reference 12c Release 1 (12.1), Subquery Factoring
* Oracle Database SQL Language Reference 12c Release 1 (12.1), Correlated Subqueries

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