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SQL>
SQL> CREATE TABLE session (
2 department CHAR(3),
3 course NUMBER(3),
4 description VARCHAR2(2000),
5 max_lecturer NUMBER(3),
6 current_lecturer NUMBER(3),
7 num_credits NUMBER(1),
8 room_id NUMBER(5)
9 );
Table created.
SQL>
SQL> INSERT INTO session(department, course, description, max_lecturer, current_lecturer, num_credits, room_id)
2 VALUES ('HIS', 101, 'History 101', 30, 11, 4, 20000);
1 row created.
SQL>
SQL> INSERT INTO session(department, course, description, max_lecturer, current_lecturer, num_credits, room_id)
2 VALUES ('HIS', 301, 'History 301', 30, 0, 4, 20004);
1 row created.
SQL>
SQL> INSERT INTO session(department, course, description, max_lecturer, current_lecturer, num_credits, room_id)
2 VALUES ('CS', 101, 'Computer Science 101', 50, 0, 4, 20001);
1 row created.
SQL>
SQL> INSERT INTO session(department, course, description, max_lecturer, current_lecturer, num_credits, room_id)
2 VALUES ('ECN', 203, 'Economics 203', 15, 0, 3, 20002);
1 row created.
SQL>
SQL> INSERT INTO session(department, course, description, max_lecturer, current_lecturer, num_credits, room_id)
2 VALUES ('CS', 102, 'Computer Science 102', 35, 3, 4, 20003);
1 row created.
SQL>
SQL> INSERT INTO session(department, course, description, max_lecturer, current_lecturer, num_credits, room_id)
2 VALUES ('MUS', 410, 'Music 410', 5, 4, 3, 20005);
1 row created.
SQL>
SQL> INSERT INTO session(department, course, description, max_lecturer, current_lecturer, num_credits, room_id)
2 VALUES ('ECN', 101, 'Economics 101', 50, 0, 4, 20007);
1 row created.
SQL>
SQL> INSERT INTO session(department, course, description, max_lecturer, current_lecturer, num_credits, room_id)
2 VALUES ('NUT', 307, 'Nutrition 307', 20, 2, 4, 20008);
1 row created.
SQL>
SQL> INSERT INTO session(department, course, description, max_lecturer, current_lecturer, num_credits, room_id)
2 VALUES ('MUS', 100, 'Music 100', 100, 0, 3, NULL);
1 row created.
SQL>
SQL>
SQL> CREATE OR REPLACE FUNCTION ClassInfo (
2 p_Department session.department%TYPE,
3 p_Course session.course%TYPE)
4 RETURN VARCHAR2 IS
5
6 studentCount NUMBER;
7 studentMax NUMBER;
8 v_PercentFull NUMBER;
9 BEGIN
10 SELECT current_lecturer, max_lecturer
11 INTO studentCount, studentMax
12 FROM session
13 WHERE department = p_Department
14 AND course = p_Course;
15
16 v_PercentFull := studentCount / studentMax * 100;
17
18 IF v_PercentFull = 100 THEN
19 RETURN 'Full';
20 ELSIF v_PercentFull > 80 THEN
21 RETURN 'Some Room';
22 ELSIF v_PercentFull > 60 THEN
23 RETURN 'More Room';
24 ELSIF v_PercentFull > 0 THEN
25 RETURN 'Lots of Room';
26 ELSE
27 RETURN 'Empty';
28 END IF;
29 END ClassInfo;
30 /
Function created.
SQL>
SQL> drop table session;
Table dropped.
SQL>
SQL>
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