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Oracle Introduction to Oracle9i: SQL Sample Questions:

1. Management has asked you to calculate the value 12*salary* commission_pct for all the employees in the EMP table. The EMP table contains these columns:

Which statement ensures that a value is displayed in the calculated columns for all employees?

A) SELECT last_name, 12*salary* commission_pct FROM emp;
B) SELECT last_name, 12*salary*(nvl(commission_pct,0)) FROM emp;
C) SELECT last_name, 12*salary* (commission_pct,0) FROM emp;
D) SELECT last_name, 12*salary*(decode(commission_pct,0)) FROM emp;

2. Which two statements are true about WHERE and HAVING clauses? (Choose two)

A) A HAVING clause can be used to restrict groups only.
B) A WHERE clause can be used to restrict both rows and groups.
C) A WHERE clause CANNOT be used in a query of the query uses a HAVING clause.
D) A WHERE clause can be used to restrict rows only.
E) A HAVING clause can be used to restrict both rows and groups.
F) A HAVING clause CANNOT be used in subqueries.

3. 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 child records in the EMPLOYEES table with department ID 40.
B) 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.
C) 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.
D) Only the row with department ID 40 is deleted in the DEPARTMENTS table.
E) The statement fails because there are no columns specifies in the DELETE clause of the DELETE statement.
F) The row with department ID 40 is deleted in the DEPARTMENTS table. Also all the rows in the EMPLOYEES table are deleted.

4. You need to change the definition of an existing table. The COMMERCIALS table needs its DESCRIPTION column changed to hold varying length characters up to 2000 bytes. The column can currently hold 1000 bytes per value. The table contains 20000 rows.
Which statement is valid?

A) ALTER TABLE commercials
MODIFY (description CHAR2(2000));
B) ALTER TABLE commercials
CHANGE (description VARCHAR2(2000));
C) You cannot increase the size of a column if the table has rows.
D) ALTER TABLE commercials
MODIFY (description VARCHAR2(2000));
E) ALTER TABLE commercials
CHANGE (description CHAR2(2000));

5. What is true about updates through a view?

A) You cannot update a view with group functions.
B) When you update a view group functions are automatically computed.
C) When you update a view the constraints on the views always override the constraints on the underlying tables.
D) When you update a view only the constraints on the underlying table will be in effect.

Solutions: