Column which contains NULL as value is not getting audit in audit table. I am using AFTER update trigger

Question

BEGIN
IF 
    NEW.id <> OLD.id OR 
    NEW.customerId <> OLD.customerId OR 

  THEN BEGIN
     INSERT INTO customerDocuments_audit
(
id,customerId,auditActionDate,auditAction)values(NEW.id,NEW.customerId, NOW(),'update'
);
     END; END IF;
END$$

If I try to update a column which contains NUll value. A column is getting updated but it is not inserting any value in an audit table.

Answer 1

You need to specifically check for NULL values as using a NULL value in a regular logical operation will always return a false result. Change your IF statement to this:

IF 
    NEW.id <> OLD.id OR 
    NEW.id IS NULL AND OLD.id IS NOT NULL OR
    NEW.id IS NOT NULL AND OLD.id IS NULL OR
    NEW.customerId <> OLD.customerId OR 
    NEW.customerId IS NULL AND OLD.customerId IS NOT NULL OR
    NEW.customerId IS NOT NULL AND OLD.customerId IS NULL

Answer 2

select a.name into v_newName from Detail a if v_newName is not null Update set a.name = v_newName else Update set a.name = value

end if