在 MySQL 查询中使用 MAX 函数

Question

我有一个 SQL 查询，我想从出勤表的 idLesson 中 idLesson 列大于 MAX 的课程表中选择行。 如何更正此查询？

SELECT student.userid, lessons.idLesson, student.fee, lessons.datePassed 
    FROM student
    Inner JOIN `project_course`.group ON group.idGroup = student.idGroup
    Inner JOIN lessons ON group.idGroup=lessons.idGroup 
    Inner JOIN attendance ON lessons.idLesson>MAX(attendance.idLesson)
    group by lessons.idlesson;

Answer 1

这是根据您的解释修改的查询

其中idLesson列大于出勤表idLesson中的MAX

SELECT student.userid, lessons.idLesson, student.fee, lessons.datePassed 
    FROM student
    Inner JOIN `project_course`.group ON group.idGroup = student.idGroup
    Inner JOIN lessons ON group.idGroup=lessons.idGroup 
WHERE lessons.idLesson > 
  ( SELECT MAX(attendance.idLesson)
    FROM attendance
  )