How to determine two different aggregate dates on employee attendance data? - sql

Question

I Need help to implement employee attendance sheet. Presently am having employee attendance i.e
Query:
SELECT c.First_name + c.Middle_name + c.last_name AS employeename,
b.Device_Person_id,a.Dept_Id,Date1,
CASE WHEN b.Device_Person_id IS NOT NULL
THEN 'P'
ELSE 'A' END AS status
FROM Emp_setting a
LEFT OUTER JOIN (SELECT Device_Person_id, MAX(logDateTime) AS Date1
FROM tempDeviceLogs
GROUP BY Device_Person_id) b
ON a.personal_id = b.Device_Person_id
LEFT OUTER JOIN persons_profile c
ON c.pesonal_id=a.personal_id
Result:
employeename Device_person_id dept_id date1 status
MEHABOOB NULL 4 NULL A
UDAY NULL 26 NULL A
SHANKRAYYA NULL 10 NULL A
BASAVARAJ NULL 24 NULL A
BHIMAPPA 5 10 2014-05-23 14:14:00.000 P
i.e. Employeename BHIMAPPA is present on 2014-05-23.
NOW I want the list of employees who is present on 2014-05-23.
Please help?

Answer 1

Assuming that logDateTime indicates the presence of the employee, and given that the current derived table returns the MAX() of this field (presumably the last time the employee was detected) you would need another join to the tempDeviceLogs table to do the filtering. You could do the filtering at the same time with an INNER JOIN, viz:
...
INNER JOIN (SELECT Device_Person_id
FROM tempDeviceLogs
WHERE logDateTime >= '2014-05-23' and logDateTime < '2014-05-24') x
ON x.Device_Person_id = a.personal_id
Edit
Given that you want to SELECT the date as well, I'm assuming you want to parameterize it / use it for a range. And making yet another assumption about your SqlServer version being >= 2008, cast the DateTime to a Date and group by it:
SELECT c.First_name + c.Middle_name + c.last_name AS employeename,
b.Device_Person_id,a.Dept_Id, Date1 as DateTimeLastSeen,
x.logDate As DatePresent,
CASE WHEN b.Device_Person_id IS NOT NULL THEN 'P' ELSE 'A' END AS status
FROM Emp_setting a
LEFT OUTER JOIN (SELECT Device_Person_id, MAX(logDateTime) AS Date1
FROM tempDeviceLogs
GROUP BY Device_Person_id) b
ON a.personal_id = b.Device_Person_id
LEFT OUTER JOIN persons_profile c
ON c.pesonal_id=a.personal_id
INNER JOIN (SELECT Device_Person_id, CAST(logDateTime AS DATE) as logDate
FROM tempDeviceLogs
GROUP BY Device_Person_id, CAST(logDateTime AS DATE)) x
ON x.Device_Person_id = a.personal_id
WHERE
logDate BETWEEN '2014-05-01' AND '2014-05-23';
This could also be done with a DISTINCT. If you have an earlier version of SqlServer, use a hack like this to obtain the date part of a DateTime (in the select + group)

Answer 2

Create a variable to hold the date which you are looking for.
DECLARE #cutOffDate DATE
SET #cutOffDate = '23-05-2014'
Then add to the end of your statement
Where Date1 = #cutOffDate