对于这种情况，如何使 MYSQL select 查询一对多？

Question

create table person {
  id int,
  name char(10),
  primary key(id),
}


create table person_child {
  id int,
  name char(10),
  primary key(id),
  foreign key(id) references person(id));
}

一个人可以有 1...n child 所以它是一对多 child 。我的查询是查找人数为 child he/she 的人的姓名？ select 语句是什么

Answer 1

使用加入和分组依据

select person.name, count(*) as num_of_child
from person 
inner join person_child on person.name = person_child.name
group by person.name;

Answer 2

Select p.name,count(PC.id) from person as p 内部加入 person_child as PC on p.ID=PC.ID Group通过 p.name 这样就可以了

对于这种情况，如何使 MYSQL select 查询一对多？

how to make MYSQL select query for one to many for this case?

mysql

one-to-many