A column right is a restriction or denial of data access to a column that a usergroup would normally have on the basis of a table right. Thus, a column right restricts a table right.
Each individual column denies access in precisely one of five (5) access modes:
The first four (4) access modes (SELECT, INSERT, UPDATE, DELETE) are mutually exclusive. ALL is a shortcut for the combination of SELECT, INSERT, UPDATE and DELETE.
In addition to access mode, the effect of each Column Right is determined by its scope.