Mysql 组_concat中的重复结果

我的数据库（3,15,6,4,15）中有这些数据，我试图使用group concat在表中显示这些数据，问题是我得到了重复的结果。（3,15,6,4,15,3,15,6,4,15,3,15,6,4,15）

我试图使用distinct，但它也消除了其他“15”

最好的解决方案是什么？ 谢谢

这是我的问题

SELECT users.*, GROUP_CONCAT(written.score separator ' - ') as Wscore, student_subject.*,SUM(written.score) as total, SUM(written.item) as item FROM users JOIN written ON users.idnumber=written.idnumber JOIN student_subject ON users.idnumber=student_subject.idnumber WHERE student_subject.teacher='$login_session' AND written.section='$section' AND written.level='$level' AND written.year='$year' AND written.subject='$subject' AND users.gender='male' AND written.period='first' GROUP BY users.idnumber order by users.lname

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您可能只想在

组中使用
独特的
。\u concat（）
：

请注意，表别名如何使查询更易于编写和读取。
实际上，我尝试在组concat中使用distinct，但其他15个则没有shown@misdirection . . . 如果要消除重复项，为什么希望15出现两次？因为它在我的数据库中（3,15,6,4,15）
SELECT u.*, GROUP_CONCAT(distinct w.score separator ' - ') as Wscore, 
       ss.*, SUM(w.score) as total, SUM(w.item) as item
FROM users u JOIN
     written w
     ON u.idnumber = w.idnumber JOIN
     student_subject ss
     ON u.idnumber = ss.idnumber
WHERE ss.teacher = '$login_session' AND w.section='$section' AND 
      w.level = '$level' AND w.year = '$year' AND w.subject = '$subject' AND 
      u.gender = 'male' AND w.period = 'first' 
GROUP BY u.idnumber
order by u.lname;