protected string MakeDdlTableCopy(TableSchema toTable, TableSchema fromTable)
 {
     return(string.Format(@"INSERT INTO {0}({1}) SELECT {3} FROM {2}",
                          MakeDdlElementName(toTable.Name), toTable.ColumnsList(MakeDdlElementName),
                          MakeDdlElementName(fromTable.Name), fromTable.ColumnsList(MakeDdlElementName)));
 }