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CREATE TABLE table_name (`ID` int, `ArrivalPort` varchar(1), `DeparturePort` varchar(1)) ; INSERT INTO table_name (`ID`, `ArrivalPort`, `DeparturePort`) VALUES (1, 'A', 'B'), (1, 'A', 'C'), (2, 'A', 'B'), (2, 'C', 'D') ;
select ID, count(distinct Port) as Count from (select id, ArrivalPort as Port from table_name union all select id, DeparturePort from table_name) t group by id;
ID
Count
1
3
2
4