Use Complex cursor to simplify the pl/sql logic

    
SQL> CREATE TABLE emp (
  2    id         NUMBER PRIMARY KEY,
  3    fname VARCHAR2(50),
  4    lname  VARCHAR2(50)
  5  );

Table created.

SQL>
SQL> INSERT INTO emp (id, fname, lname)VALUES (1, 'A', 'B');

1 row created.

SQL> INSERT INTO emp (id, fname, lname)VALUES (2, 'C', 'D');

1 row created.

SQL> INSERT INTO emp (id, fname, lname)VALUES (3, 'Enn', 'F');

1 row created.

SQL> INSERT INTO emp (id, fname, lname)VALUES (4, 'G', 'H');

1 row created.

SQL> INSERT INTO emp (id, fname, lname)VALUES (5, 'G', 'Z');

1 row created.

SQL>
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>
SQL>
SQL> CREATE OR REPLACE PROCEDURE emp_book_count
  2  AS
  3     fnameValue emp.fname%TYPE;
  4     lnameValue emp.lname%TYPE;
  5     v_row_count PLS_INTEGER := 0;
  6
  7     CURSOR auth_cur IS
  8        SELECT a.fname, a.lname, count(b.title)
  9        FROM emp a, books b
 10        WHERE a.id = b.emp1
 11        GROUP BY a.fname, a.lname
 12        HAVING count(b.title) > 0
 13        ORDER BY a.lname;
 14
 15  BEGIN
 16
 17     DBMS_OUTPUT.ENABLE(1000000);
 18
 19     OPEN auth_cur;
 20     LOOP
 21        FETCH auth_cur INTO fnameValue, lnameValue, v_row_count;
 22        EXIT WHEN auth_cur%NOTFOUND;
 23
 24        DBMS_OUTPUT.PUT_LINE(lnameValue||','||fnameValue||' wrote '||v_row_count||' book(s).');
 25     END LOOP;
 26
 27     CLOSE auth_cur;
 28
 29  EXCEPTION
 30     WHEN OTHERS
 31        THEN
 32        DBMS_OUTPUT.PUT_LINE(SQLERRM);
 33  END;
 34  /

Procedure created.

SQL> show errors
No errors.
SQL> drop table books;

Table dropped.

SQL> drop table emp;

Table dropped.

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Use Complex cursor to simplify the pl/sql logic : Cursor Value « Cursor « Oracle PL / SQL

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