SQL>
SQL> create table employee(
2 employee_id number,
3 break_reason varchar2(100),
4 break_time interval day(1) to second(2));
Table created.
SQL>
SQL> insert into employee ( employee_id, break_reason, break_time )
2 values ( 101, 'C',
3 TIMESTAMP '2001-09-03 12:47:00.000000' -
4 TIMESTAMP '2001-09-03 13:13:00.000000' );
1 row created.
SQL>
SQL> insert into employee ( employee_id, break_reason, break_time )
2 values ( 102, 'B',
3 TIMESTAMP '2001-09-03 13:35:00.000000' -
4 TIMESTAMP '2001-09-03 13:39:00.000000' );
1 row created.
SQL>
SQL> insert into employee ( employee_id, break_reason, break_time )
2 values ( 103, 'P',
3 TIMESTAMP '2001-09-03 16:30:00.000000' -
4 TIMESTAMP '2001-09-03 17:00:00.000000' );
1 row created.
SQL>
SQL> insert into employee ( employee_id, break_reason, break_time )
2 values ( 104, 'F',
3 TIMESTAMP '2001-09-03 17:00:00.000000' -
4 TIMESTAMP '2001-09-03 17:30:00.000000' );
1 row created.
SQL>
SQL> select * from employee;
EMPLOYEE_ID BREAK_REASON BREAK_TIME
----------- ------------------------------ ------------------------------
101 C -0 00:26:00.00
102 B -0 00:04:00.00
103 P -0 00:30:00.00
104 F -0 00:30:00.00
SQL>
SQL>
SQL> create table another_dept as select * from employee;
Table created.
SQL>
SQL> alter table another_dept
2 add constraint another_dept_pk
3 primary key(employee_id);
Table altered.
SQL>
SQL>
SQL> select * from another_dept;
EMPLOYEE_ID BREAK_REASON BREAK_TIME
----------- ------------------------------ ------------------------------
101 C -0 00:26:00.00
102 B -0 00:04:00.00
103 P -0 00:30:00.00
104 F -0 00:30:00.00
SQL>
SQL> drop table another_dept cascade constraints;
Table dropped.
SQL> drop table employee cascade constraints;
Table dropped.
SQL>