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create table t as select 'Ford ' as car, date('2021-05-01') as from_date, date('2021-05-09') as to_date union all select 'Ford ' as car, date('2021-05-20') as from_date, date('2021-05-30') as to_date union all select 'Ford ' as car, date('2021-06-01') as from_date, date('2021-06-07') as to_date union all select 'Ford ' as car, date('2021-06-15') as from_date, date('2021-06-20') as to_date union all select 'Ford ' as car, date('2021-06-26') as from_date, date('2021-06-30') as to_date union all select 'Chevy' as car, date('2021-04-20') as from_date, date('2021-04-29') as to_date union all select 'Chevy' as car, date('2021-05-07') as from_date, date('2021-05-12') as to_date union all select 'Chevy' as car, date('2021-05-20') as from_date, date('2021-05-23') as to_date union all select 'Chevy' as car, date('2021-06-02') as from_date, date('2021-06-10') as to_date union all select 'Tesla' as car, date('2021-04-15') as from_date, date('2021-04-30') as to_date union all select 'Tesla' as car, date('2021-05-01') as from_date, date('2021-05-30') as to_date
set @month_start = '2021-05-01'; set @month_end = '2021-06-01'; set @gap = 7; select car, min(from_date) from t where from_date >= @month_start and from_date < @month_end and not exists (select 1 from t t2 where t2.car = t.car and t2.from_date > t.to_date and t2.from_date < t.to_date + interval @gap day ) group by car
car
min(from_date)
Ford
2021-05-01
Chevy
2021-05-07
Tesla
2021-05-01