Q49. Examine the commands used to create DEPARTMENT_DETAILS and COURSE_DETAILS:
SQL>CREATE TABLE DEPARTMENT_DETAILS
(DEPARTMENT_ID NUMBER PRIMARY KEY,
DEPARTMENT_NAME VARCHAR2(50),
HOD VARCHAR2(50));
SQL>CREATE TABLE COURSE_DETAILS
(COURSE_ID NUMBER PRIMARY KEY,
COURSE_NAME VARCHAR2(50),
DEPARTMENT_ID VARCHAR2(50));
You want to generate a list of all department IDs along with any course IDs that may have been assigned to them.
Which SQL statement must you use?
A. SELECT d.department_id, c.course_id FROM department_details d RIGHT OUTER JOIN course_details c ON
(d.department_id=c. department_id);
B. SELECT d.department_id, c.course_id FROM department_details d LEFT OUTER JOIN course_details c ON
(d.department_id=c. department_id);
C. SELECT d.department_id, c.course_id FROM course_details c LEFT OUTER JOIN department_details d ON
(c.department_id=d. department_id);
D. SELECT d.department_id, c.course_id FROM department_details d RIGHT OUTER JOIN course_details c ON
(c.department_id=d. department_id);
Correct Answer: B