Problem in creating CHECK constraint

Question

While creating a table, i want to apply a CHECK constraint, that pension_amount should be in accordance of pension_code, i am getting error mentioned below.
CREATE TABLE pension_amount_check
   pension_amount         NUMBER (4),
   pension_code   NUMBER (1),
   CONSTRAINT amount_chk CHECK
      (CASE
          WHEN pension_code = 1 THEN (pension_amount = 3000 OR pension_amount > 3000)
          WHEN pension_code = 2 THEN pension_amount = 1500
       end)
ORA-00907: missing right parenthesisHow i can resolve this.

Answer 1

CREATE TABLE pension_amount_check
   pension_amount         NUMBER (4),
   pension_code   NUMBER (1),
   CONSTRAINT amount_chk CHECK
         (pension_code = 1 AND pension_amount  >= 3000)
          OR
         (pension_code = 2 AND pension_amount  = 1500)
)http://download.oracle.com/docs/cd/E11882_01/appdev.112/e17125/adfns_constraints.htm#ADFNS282