Update with + Operation

[newphpbees]

Hi..

I had encountered problem in my update code:



UPDATE kanban_checker_doz SET
virtual_doz = (count_doz_chemical_weighing + count_doz_compounding + count_doz_extrusion
+ count_doz_forming);


it did not work when I have only data in count_doz_chemical_weighing and the other is NULL.

I also tried this code but still the virtual_doz = NULL.



UPDATE kanban_checker_doz SET
virtual_doz = ((NULLIF(count_doz_chemical_weighing, 0)) + (NULLIF(count_doz_compounding, 0)) + (NULLIF(count_doz_extrusion, 0))
+ (NULLIF(count_doz_forming, 0)));


Thank you