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Question

我有一个查询以下结果

SELECT students_marks.owners_id, SUM(students_marks.points) As marks 
 FROM students_marks INNER JOIN 
      users 
      ON students_marks.owners_id = users.u_id 
 WHERE (users.first_name like '%m%' or users.username like '%m%') 
 GROUP BY owners_id 
 order by marks desc 
 limit 2

查询结果见下表

owner_id | 标记

1  | 18 
3  | 17 
2  | 17 
6  | 15 
10 | 4 

** 我只想显示分数低于 17 的结果**

Answer 1

要在聚合上使用条件，您必须使用 HAVING 。 尝试以下查询

SELECT students_marks.owners_id, SUM(students_marks.points) As marks 
 FROM students_marks INNER JOIN 
      users 
      ON students_marks.owners_id = users.u_id 
 WHERE (users.first_name like '%m%' or users.username like '%m%') 
 GROUP BY owners_id
 HAVING marks < 17 
 order by marks desc 
 limit 2