How to create advanced check condition

Question

I have an Oracle table and I would like to create a check condition like this :

ALTER TABLE MyTable
    ADD CONSTRAINT MyTable_CHK2 CHECK (
    case Dimension 
        When 1 then 
            nvl(dimensiontype1,-1)<>-1
        when 2 then 
            nvl(dimensiontype1,-1)<>-1 and nvl(dimensiontype2,-1)<>-1
        when 3 then 
            nvl(dimensiontype1,-1)<>-1 and nvl(dimensiontype2,-1)<>-1 and nvl(dimensiontype3,-1)<>-1
        else
            true
        end
    )
disable

The query is not working. I'm having the error : Missing Keyword.

Anyone know how to solve that please ?

Thanks.

Answer 1

You probably want an AND / OR expression

 ALTER TABLE MyTable
    ADD CONSTRAINT MyTable_CHK2 CHECK 
 (
    (  Dimension  =  1 and  nvl(dimensiontype1,-1)  <> - 1 ) OR
    (  Dimension  =  2 and  (nvl(dimensiontype1,-1) <> - 1 and nvl(dimensiontype2,-1)<> -1 ) ) OR
    (  Dimension  =  3 and  (nvl(dimensiontype1,-1) <>  -1 and nvl(dimensiontype2,-1)<>  -1 and nvl(dimensiontype3,-1) <> -1))
) disable  ;