Use decode() function in check constraints

   

SQL>
SQL>
SQL> create table emp
  2  ( empno      NUMBER(4)    constraint E_PK
  3                            primary key
  4  , ename      VARCHAR2(8)
  5  , init       VARCHAR2(5)
  6  , job        VARCHAR2(8)
  7  , mgr        NUMBER(4)
  8  , bdate      DATE
  9  , sal        NUMBER(6,2)   constraint E_sal_NN not null
 10  , comm       NUMBER(6,2)
 11  , deptno     NUMBER(2)    default 10
 12  , constraint E_SALES_CHK  check(decode(job,'Tester',0,1)+ nvl2(comm,1,0) = 1)
 13  ) ;

Table created.

SQL>
SQL> create index year_sal_idx
  2  on emp (12*sal + coalesce(comm,0));

Index created.

SQL>
SQL>
SQL> drop index year_sal_idx;

Index dropped.

SQL> drop table emp;

Table dropped.

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Use decode() function in check constraints : Constraint Check « Constraints « Oracle PL / SQL

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