Which MERGE statement is valid?

Examine the structure of the EMPLOYEES and NEW_EMPLOYEES tables:

Which MERGE statement is valid?

A.
MERGE INTO new_employees c
USING employees e
ON (c.employee_id = e.employee_id)
WHEN MATCHED THENUPDATE SET

B.
name = e.first_name ||’,’|| e.last_name
WHEN NOT MATCHED THEN
INSERT
value
S(e.employee_id, e.first_name ||’,
‘||e.last_name);

C.
MERGE new_employees c
USING employees e
ON (c.employee_id = e.employee_id)
WHEN EXISTS THEN
UPDATE SET

D.
name = e.first_name ||’,’|| e.last_name
WHEN NOT MATCHED THEN INSERT
valueS(e.employee_id, e.first_name ||’,
‘||e.last_name);

E.
MERGE INTO new_employees cUSING employees e
ON (c.employee_id = e.employee_id)
WHEN EXISTS THEN
UPDATE SET

F.
name = e.first_name ||’,’|| e.last_name
WHEN NOT MATCHED THEN
INSERT
value
S(e.employee_id, e.first_name ||’,
‘||e.last_name);

G.
MERGE new_employees c
FROM employees e ON (c.employee_id = e.employee_id)
WHEN MATCHED THEN
UPDATE SET

H.
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);

Explanation:
this is the correct MERGE statement syntax
Incorrect answer:
B it should MERGE INTO table_name
C it should be WHEN MATCHED THEN
D it should MERGE INTO table_name
Refer: Introduction to Oracle9i: SQL, Oracle University Study Guide, 8-29