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Oracle Introduction to Oracle9i: SQL Sample Questions:

1. Which three are true? (Choose three.)

A) A MERGE statement can be used to insert new rows into a table.
B) A MERGE statement is used to merge the data of one table with data from another.
C) A MERGE statement can be used to update existing rows in a table.
D) A MERGE statement replaces the data of one table with that of another.

2. In a SELECT statement that includes a WHERE clause, where is the GROUP BY clause placed in the SELECT statement?

A) After the WHERE clause
B) After the ORDER BY clause
C) Immediately after the SELECT clause
D) Before the FROM clause
E) Before the WHERE clause

3. Examine the structure of the EMPLOYEES and NEW_EMPLOYEES tables:

Which DELETE statement is valid?

A) DELETE * FROM employees WHERE employee_id IN (SELECT employee_id FROM new_employees WHERE last_name = 'Carrey');
B) DELETE FROM employees WHERE employee_id IN (SELECT employee_id FROM new_employees WHERE name = 'Carrey');
C) DELETE * FROM employees WHERE employee_id = (SELECT employee_id FROM new_employees);
D) DELETE FROM employees WHERE employee_id = (SELECT employee_id FROM employees);

4. Examine the structure of the EMP_DEPT_VU view:

Which SQL statement produces an error?

A) SELECT department_id, SUM(salary)
FROM emp_dept_vu
GROUP BY department_id;
B) SELECT job_id, SUM(salary)
FROM emp_dept_vu
WHERE department_id IN (10,20)
GROUP BY job_id
HAVING SUM(salary) > 20000;
C) None of the statements produce an error; all are valid.
D) SELECT department_id, job_id, AVG(salary)
FROM emp_dept_vu
GROUP BY department_id, job_id;
E) SELECT *
FROM emp_dept_vu;

5. The user Sue issues this SQL statement:
GRANT SELECT ON sue.EMP TO alice WITH GRANT OPTION;
The user Alice issues this SQL statement:
GRANT SELECT ON sue.EMP TO reena WITH GRANT OPTION;
The user Reena issues this SQL statement:
GRANT SELECT ON sue.EMP TO timber;
The user Sue issues this SQL statement:
REVOKE select on sue.EMP FROM alice;
For which users does the revoke command revoke SELECT privileges on the SUE.EMP table?

A) Sue, Alice, Reena, and Timber
B) Alice only
C) Alice, Reena, and Timber
D) Alice and Reena

Solutions: