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Oracle Introduction to Oracle9i: SQL Sample Questions:

1. Examine the data in the EMPLOYEES and DEPARTMENTS tables:

Also examine the SQL statements that create the EMPLOYEES and DEPARTMENTS tables:
CREATE TABLE departments
(department_id NUMBER PRIMARY KEY,
department_name VARCHAR2(30));
CREATE TABLE employees
(EMPLOYEE_ID NUMBER PRIMARY KEY,
EMP_NAME VARCHAR2(20),
DEPT_ID NUMBER REFERENCES
departments(department_id),
MGR_ID NUMBER REFERENCES
employees(employee id),
MGR_ID NUMBER REFERENCES
employees(employee id),
JOB_ID VARCHAR2(15).
SALARY NUMBER);
ON the EMPLOYEES,
On the EMPLOYEES table, EMPLOYEE_ID is the primary key.
MGR_ID is the ID of managers and refers to the EMPLOYEE_ID.
DEPT_ID is foreign key to DEPARTMENT_ID column of the DEPARTMENTS table.
On the DEPARTMENTS table, DEPARTMENT_ID is the primary key.
Examine this DELETE statement:
DELETE
FROM departments
WHERE department id = 40;
What happens when you execute the DELETE statement?

A) The statement fails because there are no columns specifies in the DELETE clause of the DELETE statement.
B) Only the row with department ID 40 is deleted in the DEPARTMENTS table.
C) The row with department ID 40 is deleted in the DEPARTMENTS table. Also the rows with employee IDs 110 and 106 are deleted from the EMPLOYEES table.
D) The row with department ID 40 is deleted in the DEPARTMENTS table. Also the rows with employee IDs 106 and 110 and the employees working under employee 110 are deleted from the EMPLOYEES table.
E) The row with department ID 40 is deleted in the DEPARTMENTS table. Also all the rows in the EMPLOYEES table are deleted.
F) The statement fails because there are child records in the EMPLOYEES table with department ID 40.

2. Which two statements are true about constraints? (Choose two.)

A) A UNIQUE index gets created for columns with PRIMARY KEY and UNIQUE constraints.
B) The NOT NULL constraint ensures that null values are not permitted for the column.
C) The UNIQUE constraint does not permit a null value for the column.
D) The PRIMARY KEY and FOREIGN KEY constraints create a UNIQUE index.

3. Examine the statement:
GRANT select, insert, update
ON student_grades
TO manager
WITH GRANT OPTION;
Which two are true? (Choose two.)

A) It allows the MANAGER to apply all DML statements on the STUDENT_GRADES table.
B) It allows the MANAGER the ability to select from, delete from, and update the STUDENT_GRADES table.
C) It allows the MANAGER to create tables that refer to the STUDENT_GRADES table.
D) MANAGER must be a role.
E) It allows the MANAGER the ability to select from, insert into, and update the STUDENT_GRADES table.
F) It allows the MANAGER to pass the specified privileges on to other users.

4. Examine these statements:
CREATE ROLE registrar;
GRANT UPDATE ON student_grades TO registrar;
GRANT registrar to user1, user2, user3;
What does this set of SQL statements do?

A) It creates a role called REGISTRAR, adds the UPDATE privilege on the STUDENT_GRADES object to the role, and gives the REGISTRAR role to three users.
B) It creates a role called STUDENT_GRADES, adds the UPDATE privilege on three users, and gives the UPDATE role to the registrar.
C) It creates a role called REGISTRAR, adds the UPDATE privilege on three users, and gives the REGISTRAR role to the STUDENT_GRADES object.
D) It creates a role called REGISTRAR, adds the UPDATE privilege on the STUDENT_GRADES object to the role, and creates three users with the role.
E) It creates a role called REGISTRAR, adds the MODIFY privilege on the STUDENT_GRADES object to the role, and gives the REGISTRAR role to three users.
F) The set of statements contains an error and does not work.

5. In which case would you use a FULL OUTER JOIN?

A) Both tables have NULL values.
B) You want all matched and unmatched data from only one table.
C) You want all unmatched data from one table.
D) You want all matched data from both tables.
E) One of the tables has more data than the other.
F) You want all unmatched data from both tables.

Solutions: