Hi @aysel_jafarzade, I imagine you could go with one of these options:

• create an SQL CI e.g. something like this
  SELECT attribute_1, attribute_2,

CASE

    WHEN attribute_3 is null THEN 0

    ELSE attribute_3

END AS attribute_3

FROM table;
  
   then work with this SQL CI in your DQ evaluation;
   
• in the rule implementation, create a variable that transforms the input attribute value e.g. iif(attribute_3 is null, 0, attribute_3)

Could you please describe your use case in some more detail? What do you want to achieve once you have the completed the setup? Thanks!

Thank you so much @Lisa Kovalskaia . your answer was helpful