Mysql #1241-操作数应包含1列

这里，我得到了这样的错误

1241-操作数应包含1列 我的SQL查询如下：

SELECT * 
FROM `fx_users_attendance` 
    LEFT OUTER JOIN `fx_account_details` ON fx_account_details.user_id = fx_users_attendance.user_id 
    LEFT OUTER JOIN `fx_departments` ON fx_departments.deptid = fx_account_details.department 
    LEFT OUTER JOIN `fx_users` ON fx_users.id = fx_users_attendance.user_id 
WHERE fx_departments.deptid IN(1)
AND fx_users.id IN(5)
AND YEAR(clock_in) = YEAR(CURDATE())
GROUP BY (01,02,03,04,05,06,07,08,09,10,11,12)

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它实际上说了什么？

问题应该是GROUPBY子句的语法。只要去掉括号就可以了

SELECT * 
FROM `fx_users_attendance` 
    LEFT OUTER JOIN `fx_account_details` ON fx_account_details.user_id = fx_users_attendance.user_id 
    LEFT OUTER JOIN `fx_departments` ON fx_departments.deptid = fx_account_details.department 
    LEFT OUTER JOIN `fx_users` ON fx_users.id = fx_users_attendance.user_id 
WHERE fx_departments.deptid IN(1)
AND fx_users.id IN(5)
AND YEAR(clock_in) = YEAR(CURDATE())
GROUP BY 01,02,03,04,05,06,07,08,09,10,11,12

---

也许

groupby

应该得到一个列notvalues ad参数？！使用按列名分组而不是按（01,02,03,04,05,06,07,08,09,10,11,12）分组感谢@Aioros。。。我明白了……）