I ran below code, and it generated the file successfully.
But I could not open the file, when I tried it throws an error message “Excel found unreable content in ‘my.xlsx’”
begin
as_xlsx.new_sheet( ‘query 1′ );
as_xlsx.query2sheet( ‘select 1 r from dual’, p_sheet => 1 );
as_xlsx.new_sheet( ‘query 2′ );
as_xlsx.query2sheet( ‘select 2 r from dual’, true, ‘ETF_DATA_OUT_DIR’, ‘my.xlsx’, 2 );
end;