嗨，我想在下面的查询中找到以下总和的最大值

Question

 $test = "select s.student_id, s.lastname, sum(p.amount)as Total, count(s.student_id),
     e.VALIDATEDDATE from student s, enroll e, payment p
     where  s.student_id = e.student_id and s.student_id = p.student_id
     and e.VALIDATEDDATE is not null group by s.student_id, e.VALIDATEDDATE, s.lastname;" 

$resut = i want display the highest sum as max

Answer 1

You can give it try with something like this

select s.student_id, s.lastname, sum(p.amount)as Total, count(s.student_id),
 e.VALIDATEDDATE from student s, enroll e, payment p
 where  s.student_id = e.student_id and s.student_id = p.student_id
 and e.VALIDATEDDATE is not null group by s.student_id, e.VALIDATEDDATE, s.lastname  ORDER BY sum(p.amount) desc