如何在Crystal Report上应用带有日期范围的SQL查询

Question

I have to retrieve of how many an employee attend to work between a range of two date. I managed to get the query like this

ex date range : 2012-02-03 to 2012-03-03

SELECT A.EmployeeD, A.EmployeeName, ISNULL(SUM(CASE WHEN  a.AttendanceDate BETWEEN '2012-02-03' AND '2012-03-03' THEN  1 ELSE 0 END), 0) AS AttendCount
FROM     (SELECT     EmployeeID, EmployeeName, AttendanceDate
                      FROM          dbo.tblAttendance
                      GROUP BY EMPLOYEEID, EmployeeName, AttendanceDate
         ) AS A
GROUP BY EMPLOYEEID, EmployeeName

but how do I use that so I can show it on Crystal Report (on C#) ? I mean, I want user to be able to change the date range inside the program.

I usually use select expert feature for such thing but I don't think that will work for this, as far I as I know... Can anyone help me? thanks in advance :)

Answer 1

You can offload the counting to CR...

1. Add the table 'tblAttendance' to your report
2. Create two parameters in the report, {?StartDate} and {?EndDate} that will contain your dates.
3. In your selection formula, add a line like this {tblAttendance.AttendanceDate} in {?StartDate} to {?EndDate} . At this point you have all the data you want, it's just a matter of displaying and summarizing.
4. Group by {tblAttendance.EmployeeID} and place a summary of distinctcount({tblAttendance.AttendanceDate},{tblAttendance.EmployeeID}) in the GroupHeader or GroupFooter. This just means do a distinctcount() of attendance dates grouped by employee.
5. Display the summary, employee name, and employee ID on your report.