Output discount rate based on different category : Case « PL SQL « Oracle PL / SQL

1. Oracle PL / SQL
2. PL SQL
3. Case

Output discount rate based on different category

    
SQL> CREATE TABLE books (
  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 books (isbn, category, title, num_pages, price, copyright, emp1, emp2, emp3)
  2             VALUES ('1', 'Database', 'Oracle', 563, 39.99, 2009, 1, 2, 3);

1 row created.

SQL> INSERT INTO books (isbn, category, title, num_pages, price, copyright, emp1, emp2)
  2             VALUES ('2', 'Database', 'MySQL', 765, 44.99, 2009, 4, 5);

1 row created.

SQL> INSERT INTO books (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> INSERT INTO books (isbn, category, title, num_pages, price, copyright, emp1, emp2, emp3)
  2             VALUES ('4', 'Database', 'SQL', 535, 39.99, 2002, 4, 5, 9);

1 row created.

SQL> INSERT INTO books (isbn, category, title, num_pages, price, copyright, emp1, emp2)
  2             VALUES ('5', 'Database', 'Java', 487, 39.99, 2002, 10, 11);

1 row created.

SQL> INSERT INTO books (isbn, category, title, num_pages, price, copyright, emp1, emp2)
  2             VALUES ('6', 'Database', 'JDBC', 592, 39.99, 2002, 12, 13);

1 row created.

SQL> INSERT INTO books (isbn, category, title, num_pages, price, copyright, emp1, emp2, emp3)
  2             VALUES ('7', 'Database', 'XML', 500, 39.99, 2002, 1, 2, 3);

1 row created.

SQL>
SQL> SET SERVEROUTPUT ON ESCAPE OFF
SQL>
SQL> DECLARE
  2     v_category books.category%TYPE;
  3     v_discount NUMBER(10,2);
  4     v_isbn books.isbn%TYPE := '3';
  5  BEGIN
  6     SELECT category INTO v_category FROM books WHERE isbn = v_isbn;
  7
  8     CASE v_category
  9         WHEN 'Database'
 10            THEN v_discount := .5;
 11         WHEN 'Oracle Server'
 12            THEN v_discount := .1;
 13     END CASE;
 14     DBMS_OUTPUT.PUT_LINE('The discount is '||v_discount*100||' percent');
 15  EXCEPTION
 16     WHEN OTHERS
 17     THEN
 18        DBMS_OUTPUT.PUT_LINE(SQLERRM);
 19  END;
 20  /
The discount is 50 percent

PL/SQL procedure successfully completed.

SQL>
SQL> drop table books;

Table dropped.

SQL>

   
    
    
    
  

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