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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, 'E', '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 ('72121203', 'Oracle Basics', 'Oracle DBA 101', 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 ('72122048', 'Oracle Basics', 'Oracle8i: A Beginner''s Guide', 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 ('72131454', 'Oracle Basics', 'Oracle Performance Tuning 101', 404, 39.99, 2001, 6, 7, 8);
1 row created.
SQL>
SQL>
SQL> SET SERVEROUTPUT ON ESCAPE OFF
SQL>
SQL> DECLARE
2
3 cv_emp SYS_REFCURSOR;
4 v_title BOOKS.TITLE%TYPE;
5 v_emp emp%ROWTYPE;
6 v_counter PLS_INTEGER := 0;
7
8 CURSOR book_cur
9 IS
10 SELECT b.title, CURSOR (SELECT * FROM emp a WHERE a.id = b.emp1 OR a.id = b.emp2 OR a.id = b.emp3)
11 FROM books b;
12
13 BEGIN
14
15 DBMS_OUTPUT.ENABLE(1000000);
16
17 OPEN book_cur;
18
19 LOOP
20 FETCH book_cur INTO v_title, cv_emp;
21 EXIT WHEN book_cur%NOTFOUND;
22
23 v_counter := 0;
24
25 DBMS_OUTPUT.PUT_LINE('Title from the main cursor: '||v_title);
26
27 LOOP
28 FETCH cv_emp INTO v_emp;
29 EXIT WHEN cv_emp%NOTFOUND;
30
31 v_counter := v_counter + 1;
32
33 DBMS_OUTPUT.PUT_LINE('emp'||v_counter||': '||v_emp.fname||' '||v_emp.lname);
34 END LOOP;
35 END LOOP;
36
37 CLOSE book_cur;
38
39 END;
40 /
Title from the main cursor: Oracle DBA 101
emp1: E F
emp2: C D
emp3: A B
Title from the main cursor: Oracle8i: A Beginner's Guide
emp1: G Z
emp2: G H
Title from the main cursor: Oracle Performance Tuning 101
PL/SQL procedure successfully completed.
SQL> drop table books;
Table dropped.
SQL> drop table emp;
Table dropped.
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