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Oracle Introduction to Oracle9i: SQL Sample Questions:

1. What is necessary for your query on an existing view to execute successfully?

A) The underlying tables must have data.
B) You need SELECT privileges only on the underlying tables.
C) The underlying tables must be in the same schema.
D) You need SELECT privileges on the view.

2. Examine the structure of the EMPLOYEES and NEW_EMPLOYEES tables:
EMPLOYEES EMPLOYEE_ID NUMBER Primary Key FIRST_NAME VARCHAR2(25) LAST_NAME VARCHAR2(25) HIRE_DATE DATE
NEW_EMPLOYEES EMPLOYEE_ID NUMBER Primary Key NAME VARCHAR2(60) Which MERGE statement is valid?

A) MERGE INTO new_employees c USING employees e ON (c.employee_id = e.employee_id) WHEN MATCHED THEN UPDATE SET c.name = e.first_name ||','|| e.last_name WHEN NOT MATCHED THEN INSERT VALUES (e.employee_id, e.first_name ||', '||e.last_name);
B) MERGE INTO new_employees c USING employees e ON (c.employee_id = e.employee_id) WHEN EXISTS THEN UPDATE SET c.name = e.first_name ||','|| e.last_name WHEN NOT MATCHED THEN INSERT VALUES(e.employee_id, e.first_name ||', '||e.last_name);
C) MERGE new_employees c FROM employees e ON (c.employee_id = e.employee_id) WHEN MATCHED THEN UPDATE SET c.name = e.first_name ||','|| e.last_name WHEN NOT MATCHED THEN INSERT INTO new_employees VALUES (e.employee_id, e.first_name ||', '||e.last_name);
D) MERGE new_employees c USING employees e ON (c.employee_id = e.employee_id) WHEN EXISTS THEN UPDATE SET c.name = e.first_name ||','|| e.last_name WHEN NOT MATCHED THEN INSERT VALUES (e.employee_id, e.first_name ||', '||e.last_name);

3. The database administrator of your company created a public synonym called HR for the HUMAN_RESOURCES table of the GENERAL schema, because many users frequently use this table.
As a user of the database, you created a table called HR in your schema. What happens when you execute this query?
SELECT *
FROM HR;

A) You obtain the results retrieved from the public synonym HR created by the database administrator.
B) You obtain the results retrieved from both the public synonym HR and the HR table that belongs to your schema, as a FULL JOIN.
C) You get an error message because you cannot retrieve from a table that has the same name as a public synonym.
D) You obtain the results retrieved from the HR table that belongs to your schema.
E) You obtain the results retrieved from both the public synonym HR and the HR table that belongs to your schema, as a Cartesian product.

4. Which SQL statement would you use to remove a view called EMP_DEPT_VU from your schema?

A) REMOVE emp_dept_vu;
B) REMOVE VIEW emp_dept_vu;
C) DELETE emp_dept_vu;
D) DROP VIEW emp_dept_vu;
E) DELETE VIEW emp_dept_vu;
F) DROP emp_dept_vu;

5. Examine the structure of the EMPLOYEES, DEPARTMENTS, and LOCATIONS tables.

Which two SQL statements produce the name, department name, and the city of all the employees who earn more then 10000? (Choose two)

A) SELECT emp_name, department_name, city FROM employees e, departments d, locations 1 WHERE e.department_id = d.department_id AND d.location_id = 1.location_id AND salary > 10000;
B) SELECT emp_name, department_name, city
FROM employees e, departments d, locations 1
WHERE salary > 10000;
C) SELECT emp_name, department_name, city FROM employees e NATURAL JOIN departments, locations WHERE salary > 10000;
D) SELECT emp_name, department_name, city
FROM employees e, departments d, locations 1
JOIN ON (e.department_id = d.department id)
AND (d.location_id =1.location_id)
AND salary > 10000;
E) SELECT emp_name, department_name, city
FROM employees e
JOIN departments d
USING (department_id)
JOIN locations 1
USING (location_id)
WHERE salary > 10000;

Solutions: