Add constraint to ensure that value from one column is bigger than that from another : Constraint Check « Constraints « Oracle PL / SQL






  1. Oracle PL / SQL
  2. Constraints
  3. Constraint Check

Add constraint to ensure that value from one column is bigger than that from another

   
SQL>
SQL>
SQL> create table salary
  2  ( grade      NUMBER(2)   constraint S_PK
  3                           primary key
  4  , lowerlimit NUMBER(6,2)
  5  , upperlimit NUMBER(6,2)
  6  , bonus      NUMBER(6,2)
  7  , constraint S_LO_UP_CHK check (lowerlimit <= upperlimit)
  8  ) ;

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>
SQL>
SQL> select * from salary
  2  where  grade > 3;

     GRADE LOWERLIMIT UPPERLIMIT    BONUS
---------- ---------- ---------- --------
         4       2001       3000   200.00
         5       3001       9999   500.00

SQL> COL bonus FOR 9999.99
SQL> /

     GRADE LOWERLIMIT UPPERLIMIT    BONUS
---------- ---------- ---------- --------
         4       2001       3000   200.00
         5       3001       9999   500.00

SQL>
SQL>
SQL> drop table salary;

Table dropped.








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