Description of the illustration column_clauses.eps

{ { add_column_clause
  | modify_column_clauses
  | drop_column_clause
  | add_period_clause
  | drop_period_clause
  }...
| rename_column_clause
|  modify_collection_retrieval ...
| { modify_LOB_storage_clause ... | rename_LOB_storage_clause }
|  alter_varray_col_properties ...
}