Specifies whether or not the column is to be defined as hidden.The hidden attribute determines whether the column is included in an implicit reference to the table, or whether it can be explicitly referenced in SQL statements. The default is NOT HIDDEN.

 

NOT HIDDEN

Specifies that the column is included in implicit references to the table, and that the column can be explicitly referenced.

 

IMPLICITLY HIDDEN

 

Specifies that the column is not visible in SQL statements unless the column is explicitly refrenced by name.