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Don Burleson Blog 









Oracle "with check option" syntax

Don Burleson


A "with check option" is designed for updatable views whereas a "check constraint" (coinstraint_type "V") specifies valid values for an individual column:


region_name       varchar(5),      

      CONSTRAINT check_region

      CHECK (region_name in 'north','south','east','west')


The "with check option", it is used to prevent changes to a view that would produce rows that are not included in a sub-query. 


For example, here we create a view that will only allows updates to dept='finance':





SELECT name, salary FROM emp WHERE dept = 'finance'



This means only the record of employees in the finance department can be updated using this finance_dept view.  At update time we see:


insert into (select * from emp where dept = 'finance' with check option)

    values (...);



   (select * from

       (select sal, empno from emp, dept where dept = 'finance')

    with check option)

set sal = 100000 where ename = 'KING';


A violation produces:


ORA-01402: view WITH CHECK OPTION where-clause violation


With an ORA-01412, the SQL tried to INSERT or UPDATE a record in a view that contained a WITH CHECK OPTION.  The resulting INSERT or UPDATE violates the WHERE clause of the view.



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