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SQL>
SQL> CREATE TABLE DEPT (DEPTNO NUMBER(2),DNAME VARCHAR2(14),LOC VARCHAR2(13) );
Table created.
SQL>
SQL> INSERT INTO DEPT VALUES (10, 'ACCOUNTING', 'NEW YORK');
1 row created.
SQL> INSERT INTO DEPT VALUES (20, 'RESEARCH', 'DALLAS');
1 row created.
SQL> INSERT INTO DEPT VALUES (30, 'SALES', 'CHICAGO');
1 row created.
SQL> INSERT INTO DEPT VALUES (40, 'OPERATIONS', 'BOSTON');
1 row created.
SQL>
SQL>
SQL> create table another_dept as select * from dept;
Table created.
SQL>
SQL> alter table another_dept add constraint another_dept_pk primary key( deptno );
Table altered.
SQL>
SQL> insert into another_dept values( 40, 'OPERATIONS', 'BOSTON' );
insert into another_dept values( 40, 'OPERATIONS', 'BOSTON' )
*
ERROR at line 1:
ORA-00001: unique constraint (SYS.ANOTHER_DEPT_PK) violated
SQL> insert into another_dept (loc)values( 'RESTON' );
insert into another_dept (loc)values( 'RESTON' )
*
ERROR at line 1:
ORA-01400: cannot insert NULL into ("SYS"."ANOTHER_DEPT"."DEPTNO")
SQL>
SQL> drop table another_dept;
Table dropped.
SQL> drop table dept;
Table dropped.
SQL>
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