Use least() to limit the value : LEAST « Miscellaneous Functions « Oracle PL/SQL Tutorial

1. Oracle PL/SQL Tutorial
2. Miscellaneous Functions
3. LEAST

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 + 5
  2  ,      lowerlimit + 2300
  3  ,      least(9999,upperlimit + 2300)
  4  ,      500
  5  from   salary;

   GRADE+5 LOWERLIMIT+2300 LEAST(9999,UPPERLIMIT+2300)        500
---------- --------------- --------------------------- ----------
         6            3000                        3500        500
         7            3501                        3700        500
         8            3701                        4300        500
         9            4301                        5300        500
        10            5301                        9999        500

SQL>
SQL>
SQL> drop table salary;

Table dropped.