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create table personas (idpersona int, nombrepersona varchar(255)); create table asistencias(idpersona int, fecha date); insert into personas (idpersona, nombrepersona) values (1, 'juan'), (2, 'pedro'); insert into asistencias(idpersona, fecha) values (1, '2021-08-01'), (2, '2021-08-03'), (1, '2021-08-03');
select p.idpersona, p.nombrepersona, f.fecha from (select p1.idpersona, a1.fecha from (select distinct fecha from asistencias) a1 cross join personas p1 ) f left join asistencias a on f.fecha = a.fecha and a.idpersona = f.idpersona inner join personas p on p.idpersona = f.idpersona where a.fecha is null
idpersona
nombrepersona
fecha
2
pedro
2021-08-01