order_info_r %>% arrange(desc(sales))     # desc 내림차순

# A tibble: 391 x 5
    order_no           item_id  reserv_no  quantity    sales
    <chr>              <chr>    <chr>         <dbl>    <dbl>
 1  191220674084100000  M0001   2019122002       23    52000
 2  191226137434810000  M0005   2019122601       12   420000
 3  191202578574100000  M0005   2019120202       12   420000
 4  191004137339310000  M0005   2019100401        8   280000
 5  191121137367610000  M0005   2019112101        8   280000
 6  191121537853210000  M0005   2019112102        8   280000
 7  191226137440910000  M0001   2019122602       11   264000
 8  191226137864110000  M0001   2019122604       11   264000
 9  191228137837810000  M0001   2019122806       10   240000
10  191202578574100000  M0001   2019120202       10   240000
# ... with 381 more rows