I re-written the complete question because I was not clear enough the first time.
I am trying to update a given row id in users table and fill only values that are null, like this:
UPDATE USERS SET
address='Main Street' IF current address IS NULL
gender='M' AND full_name='JOHN SMITH' IF both gender and full_name ARE NULL
job='Mechanic' IF current job is NULL
WHERE id=123
I don't know how to do the part with updateing both gender and full_name, I want the other fields to still trigger and update individually regardless of the gender
and full_name
values