Use user-defined function in if statement : Function Definition « Stored Procedure Function « Oracle PL / SQL

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Oracle PL / SQL » Stored Procedure Function » Function Definition 
Use user-defined function in if statement
    
SQL>
SQL> set serveroutput on
SQL>
SQL>
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', 3011420000);

row created.

SQL>
SQL> INSERT INTO session(department, course, description, max_lecturer, current_lecturer, num_credits, room_id)
  2              VALUES ('HIS', 301'History 301', 300420004);

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', 500420001);

row created.

SQL>
SQL> INSERT INTO session(department, course, description, max_lecturer, current_lecturer, num_credits, room_id)
  2              VALUES ('ECN', 203'Economics 203', 150320002);

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', 353420003);

row created.

SQL>
SQL> INSERT INTO session(department, course, description, max_lecturer, current_lecturer, num_credits, room_id)
  2              VALUES ('MUS', 410'Music 410', 54320005);

row created.

SQL>
SQL> INSERT INTO session(department, course, description, max_lecturer, current_lecturer, num_credits, room_id)
  2              VALUES ('ECN', 101'Economics 101', 500420007);

row created.

SQL>
SQL> INSERT INTO session(department, course, description, max_lecturer, current_lecturer, num_credits, room_id)
  2              VALUES ('NUT', 307'Nutrition 307', 202420008);

row created.

SQL>
SQL> INSERT INTO session(department, course, description, max_lecturer, current_lecturer, num_credits, room_id)
  2              VALUES ('MUS', 100'Music 100', 10003, NULL);

row created.

SQL>
SQL>
SQL> CREATE OR REPLACE FUNCTION AlmostFull (
  2    p_Department session.department%TYPE,
  3    p_Course     session.course%TYPE)
  4    RETURN BOOLEAN IS
  5
  6    studentCount NUMBER;
  7    studentMax     NUMBER;
  8    v_ReturnValue     BOOLEAN;
  9    v_FullPercent     CONSTANT NUMBER := 80;
 10  BEGIN
 11    SELECT current_lecturer, max_lecturer
 12      INTO studentCount, studentMax
 13      FROM session
 14      WHERE department = p_Department
 15      AND course = p_Course;
 16
 17    IF (studentCount / studentMax * 100>= v_FullPercent THEN
 18      v_ReturnValue := TRUE;
 19    ELSE
 20      v_ReturnValue := FALSE;
 21    END IF;
 22
 23    RETURN v_ReturnValue;
 24  END AlmostFull;
 25  /

Function created.

SQL>
SQL>
SQL> DECLARE
  2    CURSOR c_session IS
  3      SELECT department, course
  4        FROM session;
  5  BEGIN
  6    FOR v_ClassRecord IN c_session LOOP
  7      IF AlmostFull(v_ClassRecord.department, v_ClassRecord.courseTHEN
  8        DBMS_OUTPUT.PUT_LINE(v_ClassRecord.department || ' ' || v_ClassRecord.course || ' is almost full!');
  9      END IF;
 10    END LOOP;
 11  END;
 12  /
MUS 410 is almost full!

PL/SQL procedure successfully completed.

SQL>
SQL> drop table session;

Table dropped.

   
    
    
  
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