在mysql中连接第一个表的第一行和第二个表的最后一行的两个表

Question

我在mysql中有两个表

personal_details

reg_id    fname    lname    mobile  
   1        x      y        9999999999  
   2        m      n        8888888888  
   3        a      b        7777777777  

education_details

edu_id   reg_id    qualification  
  1        1         High-school  
  2        1         Intermediate   
  3        2         High-school  
  4        2         Intermediate   
  5        2         B.A  
  6        3         High-school  

结果，我想要的是

   
reg_id   fname  lname      mobile       qualification  
  1         x     y        999999999    Intermediate  
  2         m     n        888888888    B.A  
  3         a     b        777777777    High-school  

我已经尝试了很多但没有得到准确的结果

我到目前为止尝试过：

class PossibleAnswerSerializer(serializers.ModelSerializer):
   companyId = serializers.SerializerMethodField()

   def get_companyId(self, obj):
        return obj.pollId.companyId

   class Meta:
       model = PossibleAnswer
       fields = ('answerString', 'token', 'pollId', 'companyId',)

Answer 1

使用join

    select * from personal_details p
    right join education_details e
    on p.reg_id=e.reg_id
    where edu_id=
(select max(edu_id) from education_details pnew where pnew.edu_id=p.edu_id)