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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, '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>
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>
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>
SQL>
SQL> SET SERVEROUTPUT ON ESCAPE OFF
SQL>
SQL> DECLARE
2
3 v_fname 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 OR a.id = b.emp2
12 OR a.id = b.emp3
13 GROUP BY a.fname, a.lname
14 HAVING count(b.title) > 0
15 ORDER BY a.lname;
16
17 BEGIN
18
19 DBMS_OUTPUT.ENABLE(1000000);
20
21 OPEN auth_cur;
22 LOOP
23 FETCH auth_cur INTO v_fname, lnameValue, v_row_count;
24 EXIT WHEN auth_cur%NOTFOUND;
25
26 DBMS_OUTPUT.PUT_LINE(lnameValue||','||v_fname||' wrote '||v_row_count||' book(s).');
27 END LOOP;
28
29 CLOSE auth_cur;
30
31 EXCEPTION
32 WHEN OTHERS
33 THEN
34 DBMS_OUTPUT.PUT_LINE(SQLERRM);
35 END;
36 /
B,A wrote 2 book(s).
D,C wrote 2 book(s).
F,Enn wrote 2 book(s).
H,G wrote 2 book(s).
Z,G wrote 2 book(s).
PL/SQL procedure successfully completed.
SQL> drop table books;
Table dropped.
SQL> drop table emp;
Table dropped.
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