Question

我的Query

出错

1055 SELECT列表的表达式＃2不在GROUP BY子句中，并且包含未聚合的列'dms.HrAttLogsFormatted.ScanIn'，该列为在功能上不依赖于GROUP BY子句中的列；这是与sql_mode = only_full_group_by
不兼容

查询：

SELECT
    Employee.Id as Id,
    Employee.FingerId as FingerId,
    Employee.Name as Name,
    Departement.Departement as Departement,
    EmployeeShift.Shift as Shift,
    ScanIn
FROM
    HrEmployee as Employee
    LEFT JOIN HrEmployeeShift as EmployeeShift 
        ON Employee.ShiftId = EmployeeShift.Id
    LEFT JOIN CmDept as Departement 
        ON Employee.DeptId = Departement.Id
    LEFT JOIN (
        SELECT
            TableEmployee.FingerId,
            ScanIn
        FROM
            HrEmployee as TableEmployee,
            HrAttLogsFormatted
        WHERE
            TableEmployee.FingerId = HrAttLogsFormatted.FingerId
            AND DateIn = '2019-11-04'
        GROUP BY HrAttLogsFormatted.FingerId
    ) AS HrJoinLogs 
        ON Employee.FingerId = HrJoinLogs.FingerId
WHERE
    Employee.Status = 1
    AND Employee.Flag = 1
    AND Employee.ShiftId = 1
    AND ScanIn is NULL
GROUP BY
    Employee.Name
ORDER BY
    Employee.Name ASC

有人可以解决吗？

Answer 1

首先，了解MySQL的notorious non-standard handling of GROUP BY. Here.

第二，您似乎正在使用GROUP BY从结果集中消除重复项。该程序值得怀疑。我认为当您的查询涉及其他人的钱时，这是不可接受的。您可能要改用SELECT DISTINCT。但是，最好的选择是找出此查询的预期逻辑，然后重写它以更明确地传递该逻辑。

如果您仍然认为需要GROUP BY，请在升级到更新版本的MySQL之前先查看查询开始的结果集。您将看到结果集的ScanIn列的所有行均为NULL，因为查询显示为AND ScanIn IS NULL。

因此，按ScanIn分组不会造成任何伤害。将, ScanIn添加到两个GROUP BY子句中。

使用与sql_mode = only_full_group_by不兼容的MySQL查询

1 个答案: