Compare three variables with if statement

    
SQL> CREATE TABLE book (
  2    isbn      CHAR(10) PRIMARY KEY,
  3    category  VARCHAR2(20),
  4    title     VARCHAR2(100),
  5    num_pages NUMBER,
  6    price     NUMBER,
  7    copyright NUMBER(4),
  8    emp1   NUMBER,
  9    emp2   NUMBER,
 10    emp3   NUMBER
 11  );

Table created.

SQL>
SQL> INSERT INTO book (isbn, category, title, num_pages, price, copyright, emp1, emp2, emp3)
  2             VALUES ('1', 'Database', 'Oracle', 563, 39.99, 1999, 1, 2, 3);

1 row created.

SQL> INSERT INTO book (isbn, category, title, num_pages, price, copyright, emp1, emp2)
  2             VALUES ('2', 'Database', 'MySQL', 765, 44.99, 1999, 4, 5);

1 row created.

SQL> INSERT INTO book (isbn, category, title, num_pages, price, copyright, emp1, emp2, emp3)
  2             VALUES ('3', 'Database', 'SQL Server', 404, 39.99, 2001, 6, 7, 8);

1 row created.

SQL>
SQL> DECLARE
  2    e_Duplicateemp EXCEPTION;
  3
  4    v_emp1 book.emp1%TYPE;
  5    v_emp2 book.emp2%TYPE;
  6    v_emp3 book.emp3%TYPE;
  7  BEGIN
  8    SELECT emp1, emp2, emp3
  9      INTO v_emp1, v_emp2, v_emp3
 10      FROM book
 11      WHERE title = 'XML';
 12
 13    IF (v_emp1 = v_emp2) OR (v_emp1 = v_emp3) OR(v_emp2 = v_emp3) THEN
 14       RAISE e_Duplicateemp;
 15    END IF;
 16  EXCEPTION
 17    WHEN e_Duplicateemp THEN
 18      INSERT INTO log_table (info) VALUES ('XML has duplicate emp');
 19  END;
 20  /
SQL>
SQL> drop table book;

Table dropped.

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Compare three variables with if statement : IF « PL SQL « Oracle PL / SQL

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