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-- Hint: use Ctrl+Enter for SQL autocomplete create table persons ( person_1 int, person_2 int, index persons(person_1, person_2) ); insert into persons values (1, 2), (3, 1), (2, 3); select 1 as person, IF (person_1 = 1, person_2, person_1) person_contact from persons where person_1 = 1 or person_2 = 1 ; explain select 1 as person, IF (person_1 = 1, person_2, person_1) person_contact from persons where person_1 = 1 or person_2 = 1 ;
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