Description of the illustration add_column_clause.eps

ADD
    { column_definition | virtual_column_definition } 
     | ( { column_definition | virtual_column_definition } 
         [, { column_definition | virtual_column_definition } ]...
         [ domain_definition [, domain_definition ]...
        )
   [ column_properties ]
   [ ( out_of_line_part_storage [, out_of_line_part_storage]... ) ]