Examine the structure of the EMPLOYEES table:
EMPLOYEE_ID NUMBER Primary Key
FIRST_NAME VARCHAR2(25)
LAST_NAME VARCHAR2(25)
Which three statements insert a row into the table? (Choose three.)
A.
INSERT INTO employees VALUES ( NULL, ‘John’, ‘Smith’);
B.
INSERT INTO employees( first_name, last_name) VALUES( ‘John’, ‘Smith’);
C.
INSERT INTO employees VALUES ( 1000, ‘John’, NULL);
D.
INSERT INTO employees (first_name, last_name, employee_id) VALUES ( 1000, ‘John’, ‘Smith’);
E.
INSERT INTO employees (employee_id) VALUES (1000);
F.
INSERT INTO employees (employee_id, first_name, last_name) VALUES ( 1000, ‘John’, ‘ ‘);
Explanation:
. EMPLOYEE_ID is a primary key.
Incorrect answer:
A:
EMPLOYEE_ID cannot be null
B:
EMPLOYEE_ID cannot be null
D:
mismatch of field_name with datatype
Refer: Introduction to Oracle9i: SQL, Oracle University Study Guide, 10-11