>Yes, NULL can't be compared. NULL is just "Don't know" If you want to compare NULLs use NVL() function:
>

>? NVL(oLeft.FieldWithNull,0)  == NVL(oRight.FieldWithNull,0)  && If FieldWithNull is some of the numeric fields
>? NVL(oLeft.FieldWithNull,[]) == NVL(oRight.FieldWithNull,[]) && If FieldWithNull is char
>? NVL(oLeft.FieldWithNull,{}) == NVL(oRight.FieldWithNull,{}) && If FieldWithNull is date
>

No I don't want to compare each field seperately, but now I understand why the my comparison results in null. Thanks.