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Question ID 1740

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 1000 bytes. The column can currently hold 500 bytes per value. The table contains 20000 rows. Which statement is valid?

Option A

A.    ALTER TABLE commercials MODIFY (description CHAR2(1000));
 

Option B

B.    You cannot increase the size of a column if the table has rows.
 

Option C

C.    ALTER TABLE commercials
CHANGE (description VARCHAR2(1000));
 

Option D

D.    ALTER TABLE commercials CHANGE (description CHAR2(1000));
 

Option E

E.    ALTER TABLE commercials
MODIFY (description VARCHAR2(1000));
 

Correct Answer E
Explanation


Question ID 1741

Click the Exhibit button to examine the structure of the EMPLOYEES, DEPARTMENTS, and LOCATIONS tables.
Two new departments are added to your company as shown:
 
DEPARTMENT_ID DEPARTMENT_NAME MGR_ID LOCATION_ID 9998 Engineering 123
9999 Administrative Boston
You need to list the names of employees, the department IDs, the department names, and the cities where the departments are, even if there are no employees in the departments and even if the departments are not yet assigned to a location. You need to join the EMPLOYEES, DEPARTMENTS, and LOCATIONS tables to retrieve this information.
Which statement do you execute to retrieve this information?

Option A

Option B

B.    SELECT last_name, department_id, department_name, city
FROM departments d
NATURAL JOIN employees e NATURAL JOIN locations l;
 

Option C

C.    SELECT e.last_name, d.department_id, d.department_name, l.city
FROM departments d
LEFT OUTER JOIN employees e
ON d.department_id = e.department_id LEFT OUTER JOIN locations l
ON d.location_id = l.location_id;
 

Option D

D. SELECT e.last_name, d.department_id,
d.department_name, l.city
FROM departments d
RIGHT OUTER JOIN employees e
ON d.department_id = e.department_id
RIGHT OUTER JOIN locations l
ON d.location_id = l.location_id;
 

Correct Answer C
Explanation

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