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SQL> CREATE TABLE project (
2 pro_id NUMBER(4),
3 pro_name VARCHAR2(40),
4 budget NUMBER(9,2),
5 CONSTRAINT project_pk PRIMARY KEY (pro_id)
6 );
Table created.
SQL>
SQL>
SQL> INSERT INTO project(pro_id, pro_name, budget)VALUES (1001, 'A',12345);
1 row created.
SQL> INSERT INTO project(pro_id, pro_name, budget)VALUES (1002, 'ERP',23456);
1 row created.
SQL> INSERT INTO project(pro_id, pro_name, budget)VALUES (1003, 'SQL',34567);
1 row created.
SQL> INSERT INTO project(pro_id, pro_name, budget)VALUES (1004, 'CRM',45678);
1 row created.
SQL> INSERT INTO project(pro_id, pro_name, budget)VALUES (1005, 'VPN',56789);
1 row created.
SQL>
SQL>
SQL> CREATE TABLE server_usage (
2 pro_id NUMBER(4),
3 emp_id NUMBER,
4 time_log_date DATE,
5 hours_logged NUMBER(8,2),
6 dollars_charged NUMBER(8,2),
7 CONSTRAINT server_usage_pk PRIMARY KEY (pro_id, emp_id, time_log_date)
8 );
Table created.
SQL> INSERT INTO server_usage(pro_id, emp_id, time_log_date, hours_logged, dollars_charged)
2 VALUES (1001,101,to_date('4-Apr-2004','dd-mon-yyyy'),1123,222);
1 row created.
SQL> INSERT INTO server_usage(pro_id, emp_id, time_log_date, hours_logged, dollars_charged)
2 VALUES (1002,102,to_date('4-Apr-2005','dd-mon-yyyy'),1124,223);
1 row created.
SQL> INSERT INTO server_usage(pro_id, emp_id, time_log_date, hours_logged, dollars_charged)
2 VALUES (1003,103,to_date('4-Apr-2006','dd-mon-yyyy'),1125,224);
1 row created.
SQL> INSERT INTO server_usage(pro_id, emp_id, time_log_date, hours_logged, dollars_charged)
2 VALUES (1004,104,to_date('4-Apr-2007','dd-mon-yyyy'),1126,225);
1 row created.
SQL> INSERT INTO server_usage(pro_id, emp_id, time_log_date, hours_logged, dollars_charged)
2 VALUES (1005,105,to_date('4-Apr-2008','dd-mon-yyyy'),1127,226);
1 row created.
SQL> INSERT INTO server_usage(pro_id, emp_id, time_log_date, hours_logged, dollars_charged)
2 VALUES (1001,106,to_date('4-Apr-2009','dd-mon-yyyy'),1128,227);
1 row created.
SQL> INSERT INTO server_usage(pro_id, emp_id, time_log_date, hours_logged, dollars_charged)
2 VALUES (1002,107,to_date('4-Apr-2010','dd-mon-yyyy'),1129,228);
1 row created.
SQL> SET ECHO ON
SQL>
SQL> SET TRANSACTION READ WRITE;
SQL>
SQL>
SQL> INSERT INTO project
2 SELECT 2008, pro_name, budget FROM project
3 WHERE pro_id = 1002;
1 row created.
SQL>
SQL>
SQL> UPDATE server_usage
2 SET pro_id = 2008
3 WHERE pro_id = 1002;
2 rows updated.
SQL>
SQL>
SQL> ROLLBACK;
Rollback complete.
SQL>
SQL>
SQL> drop table project;
Table dropped.
SQL> drop table server_usage;
Table dropped.
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