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Oracle Introduction to Oracle9i: SQL Sample Questions:

1. You define a multiple-row subquery in the WHERE clause of an SQL query with a comparison operator "=".
What happens when the main query is executed?

A) The main query executes with the last value returned by the subquery.
B) You cannot define a multiple-row subquery in the WHERE clause of a SQL query.
C) The main query executes with the first value returned by the subquery.
D) The main query fails because the multiple-row subquery cannot be used with the comparison operator.
E) The main query executes with all the values returned by the subquery.

2. Evaluate these two SQL statements:
SELECT last_name, salary, hire_date FROM EMPLOYEES ORDER BY salary DESC; SELECT last_name, salary, hire_date FROM EMPLOYEES ORDER BY 2 DESC; What is true about them?

A) The second statement returns a syntax error.
B) The two statements can be made to produce identical results by adding a column alias for the salary column in the second SQL statement.
C) There is no need to specify DESC because the results are sorted in descending order by default.
D) The two statements produce identical results.

3. Which object privileges can be granted on a view?

A) DELETE, INSERT,SELECT
B) DELETE, INSERT, SELECT, UPDATE
C) ALTER, DELETE, INSERT, SELECT
D) none

4. Which statement adds a constraint that ensures the CUSTOMER_NAME column of the CUSTOMERS table holds a value?

A) ALTER TABLE customers ADD CONSTRAINT cust_name_nn CHECK customer_name IS NOT NULL;
B) ALTER TABLE customers MODIFY name CONSTRAINT cust_name_nn NOT NULL;
C) ALTER TABLE customers ADD CONSTRAINT cust_name_nn CHECK customer_name NOT NULL;
D) ALTER TABLE customers MODIFY customer_name CONSTRAINT cust_name_nn IS NOT NULL;
E) ALTER TABLE customers MODIFY customer_name CONSTRAINT cust_name_nn NOT NULL;
F) ALTER TABLE customers MODIFY CONSTRAINT cust_name_nn CHECK customer_name IS NOT NULL;

5. EMPLOYEES and DEPARTMENTS data:

On the EMPLOYEES table, EMPLOYEE_ID is the primary key. MGR_ID is the ID
managers and refers to the EMPLOYEE_ID.
On the DEPARTMENTS table DEPARTMENT_ID is the primary key.
Evaluate this UPDATE statement.
UPDATE employees
SET mgr_id =
(SELECT mgr_id
FROM employees
WHERE dept_id=
(SELECT department_id
FROM departments
WHERE department_name = 'Administration')),
Salary = (SELECT salary
FROM employees
WHERE emp_name = 'Smith')
WHERE job_id = 'IT_ADMIN';
What happens when the statement is executed?

A) The statement fails because there is no 'Administration' department in the DEPARTMENTS table.
B) The statement fails because there is more than one row matching the IT_ADMIN job ID in the EMPLOYEES table.
C) The statement executes successfully, leaves the manager ID as the existing value, and changes the salary to 4000 for the employees with ID 103 and 105.
D) The statement executes successfully, changes the manager ID to NULL, and changes the salary to 3000 for the employees with ID 103 and 105.
E) The statement executes successfully, changes the manager ID to NULL, and changes the salary to 4000 for the employees with ID 103 and 105.
F) The statement fails because there is more than one row matching the employee name Smith.

Solutions: