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Oracle Introduction to Oracle9i: SQL Sample Questions:

1. Examine the structure of the EMPLOYEES and DEPARTMENTS tables:

You want to create a report displaying employee last names, department names, and locations. Which query should you use to create an equi-join?

A) SELECT e.last_name, d.department_name, d.location_id
FROM employees e, departments D
WHERE e.department_id =d.department_id;
B) SELECT e.last_name, d.department_name, d.location_id
FROM employees e, departments D
WHERE manager_id =manager_id;
C) SELECT last_name, department_name, location_id
FROM employees , departments ;
D) SELECT employees.last_name, departments.department_name,
departments.location_id
FROM employees e, departments D
WHERE e.department_id =d.department_id;

2. Evaluate this SQL statement:
SELECT e.EMPLOYEE_ID,e.LAST_NAME,e.DEPARTMENT_ID, d.DEPARTMENT_NAME
FROM EMP e, DEPARTMENT d
WHERE e.DEPARTMENT_ID = d.DEPARTMENT_ID;
In the statement, which capabilities of a SELECT statement are performed?

A) Difference, projection, join
B) Intersection, projection, join
C) Difference, projection, product
D) Selection, projection, join
E) Selection, intersection, join

3. Scott issues the SQL statements:

If Sue needs to select from Scott's DEPT table, which command should she use?

A) SELECT *
FROM DEPT;
B) SELECT *
FROM DBA.SCOTT.DEPT;
C) SELECT *
FROM ALL_USERS
WHERE USER_NAME = 'SCOTT'
AND TABLE NAME = 'DEPT';
D) SELECT *
FROM SCOTT.DEPT;

4. You need to modify the STUDENTS table to add a primary key on the STUDENT_ID column. The table is currently empty.
Which statement accomplishes this task?

A) ALTER TABLE studentsMODIFY CONSTRAINT stud_id_pk PRIMARY KEY (student_id);
B) ALTER TABLE students ADD CONSTRAINT stud_id_pk PRIMARY KEY (student_id);
C) ALTER TABLE students ADD PRIMARY KEY student_id;
D) ALTER TABLE students ADD CONSTRAINT stud_id_pk PRIMARY KEY student_id;
E) ALTER TABLE students ADD CONSTRAINT PRIMARY KEY (student_id);

5. Exhibit:

Examine the data in the EMPLOYEES table.
Examine the subquery:
SELECT last_name FROM employees WHERE salary IN (SELECT MAX(salary) FROM employees GROUP BY department_id);
Which statement is true?

A) The SELECT statement does not work because there is no HAVING clause.
B) The SELECT statement is syntactically accurate.
C) The SELECT statement does not work because the GROUP BY clause should be in the
main query and not in the subquery.
D) The SELECT statement does not work because the column specified in the GROUP BY clause is not in the SELECT list.

Solutions: