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create table t_hr_ship ( shipment_id int, shipper_id int, date_time date, pickup_state varchar(20), dropoff_state varchar(20));
insert into t_hr_ship values (1, 1, "2018-01-01", "WA", "OR"), (2, 1, "2018-01-02", "WA", "OR"), (3, 1, "2018-01-03", "WA", "OR"), (4, 1, "2018-01-04", "WA", "OR"), (5, 2, "2018-01-05", "WA", "OR"), (6, 3, "2018-01-06", "WA", "OR"), (7, 2, "2018-02-01", "OR", "WA"), (8, 4, "2018-02-02", "OR", "WA"), (9, 3, "2018-02-03", "WA", "CA"), (10, 5, "2018-02-04", "CA", "OR"), (11, 2, "2018-03-05", "WA", "TX"), (12, 3, "2018-01-06", "OR", "CA");
select least(pickup_state, dropoff_state) pickup, greatest(pickup_state, dropoff_state) dropoff, count(*) as no_of_shipment from t_hr_ship s where month(date_time) in (1, 2) group by pickup, dropoff order by no_of_shipment desc limit 3;
pickup
dropoff
no_of_shipment
OR
WA
8
CA
OR
2
CA
WA
1