An alternate method is to use a formula such as this for the column:
(IFNULL(UserNameCol,(CVAL('USER'),UserNameCol))
It will then only update when it is null with the current user name.
An alternate method is to use a formula such as this for the column:
(IFNULL(UserNameCol,(CVAL('USER'),UserNameCol))
It will then only update when it is null with the current user name.