Query with MySQL incompatible with sql_mode=only_full_group_by - mysql

Question

I have error on my Query
1055 Expression #2 of SELECT list is not in GROUP BY clause and
contains nonaggregated column 'dms.HrAttLogsFormatted.ScanIn' which is
not functionally dependent on columns in GROUP BY clause; this is
incompatible with sql_mode=only_full_group_by
Query :
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
Does anyone have a solution?

Answer 1

First, read about MySQL's notorious non-standard handling of GROUP BY. Here.
Second, it looks like you're using GROUP BY to eliminate duplicates from your result set. That procedure is questionable. In my opinion it's unacceptable when your query deals with other peoples' money. You may want to use SELECT DISTINCT instead. But, your best bet is to figure out the intended logic of this query and rewrite it to deliver that logic more explicitly.
If you still think you need GROUP BY, look at a result set from when your query worked, before you upgraded to a more modern version of MySQL. You will see that all rows of your result set's ScanIn column are NULL, because your query says AND ScanIn IS NULL.
So, grouping by ScanIn won't hurt anything. Add , ScanIn to both GROUP BY clauses.