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create table trip (goid varchar(255), backid varchar(255)); insert into trip (goid, backid) values ('EGLL', 'EGLL'); insert into trip (goid, backid) values ('VABB', 'VABB'); insert into trip (goid, backid) values ('KSEE', 'BHAS'); insert into trip (goid, backid) values ('EGNM', 'YSSY'); insert into trip (goid, backid) values ('OBMD', 'KSBD'); insert into trip (goid, backid) values ('EGLL', 'VABB');
SELECT id, COUNT(*) FROM ( SELECT goid AS id FROM trip UNION ALL SELECT backid FROM trip ) t GROUP BY id;
id
COUNT(*)
EGLL
3
VABB
3
KSEE
1
EGNM
1
OBMD
1
BHAS
1
YSSY
1
KSBD
1