SQL>
SQL>
SQL> create table salary
2 ( grade NUMBER(2) constraint S_PK primary key
3 , lowerlimit NUMBER(6,2)
4 , upperlimit NUMBER(6,2)
5 , bonus NUMBER(6,2)
6 , constraint S_LO_UP_CHK check (lowerlimit <= upperlimit)
7 ) ;
Table created.
SQL>
SQL> insert into salary values (1, 700,1200, 0);
1 row created.
SQL> insert into salary values (2, 1201,1400, 50);
1 row created.
SQL> insert into salary values (3, 1401,2000, 100);
1 row created.
SQL> insert into salary values (4, 2001,3000, 200);
1 row created.
SQL> insert into salary values (5, 3001,9999, 500);
1 row created.
SQL>
SQL> select grade, upperlimit - lowerlimit
2 from salary;
GRADE UPPERLIMIT-LOWERLIMIT
---------- ---------------------
1 500
2 199
3 599
4 999
5 6998
SQL>
SQL> drop table salary;
Table dropped.
SQL>