내림차순으로 정렬하고 싶으면 desc 옵션을 추가합니다.
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