{ column_definition
| virtual_column_definition
| { out_of_line_constraint
  | out_of_line_ref_constraint
  | supplemental_logging_props
  }
}
  [, { column_definition
     | virtual_column_definition
     | { out_of_line_constraint
       | out_of_line_ref_constraint
       | supplemental_logging_props
       }
     }
  ]...