RETURN statement. : Function Return « Stored Procedure Function « Oracle PL / SQL

1. Oracle PL / SQL
2. Stored Procedure Function
3. Function Return

RETURN statement.

    
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>
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>
SQL> drop table session;

Table dropped.

   
    
    
  

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