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Oracle Introduction to Oracle9i: SQL Sample Questions:

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

Which MERGE statement is valid?

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

2. You own a table called EMPLOYEES with this table structure:
EMPLOYEE_ID NUMBER Primary Key FIRST_NAME VARCHAR2(25) LAST_NAME VARCHAR2(25) HIRE_DATE DATE
What happens when you execute this DELETE statement?
DELETE employees;

A) The data and structure of the EMPLOYEES table are deleted.
B) You get an error because of a primary key violation.
C) The data in the EMPLOYEES table is deleted but not the structure.
D) You get an error because the statement is not syntactically correct.

3. Which SQL statement accepts user input for the columns to be displayed, the table name, and WHERE condition?

A) SELECT &1, &2
FROM &3
WHERE last_name = '&4';
B) SELECT &1, '&2'
FROM &3
WHERE '&last_name = '&4' ';
C) SELECT &1, '&2'
FROM EMP
WHERE last_name = '&4';
D) SELECT &1, "&2"
FROM &3
WHERE last_name = '&4';

4. Scott issues the SQL statements:

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

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

5. Exhibit

The COMMISSION column shows the monthly commission earned by the employee.
Which two tasks would require subqueries or joins in order to be performed in a single step? (Choose two.)

A) finding the total commission earned by the employees in department 10
B) listing the departments whose average commission is more that 600
C) listing the employees whose annual commission is more than 6000
D) finding the number of employees who earn a commission that is higher than the average commission of the company
E) listing the employees who earn the same amount of commission as employee 3
F) listing the employees who do not earn commission and who are working for department 20 in descending order of the employee ID

Solutions: