Can we use group by and where condition with same fieldname

Question

I have a requirement like have to pull all records in the date range the user selected, selecting all employees who started from 15-Jan-2011 to 20-Aug-2011 and group by date.

Answer 1

You can, but the "GROUP BY" clause is used for grouping together sets of rows, so it does not make sense for your question (or anything that involves a "SELECT *").

To answer your question though:

SELECT DATEADD(dd, 0, DATEDIFF(dd,0,StartDate)) AS 'StartDate', 
FROM   Employees
WHERE  StartDate BETWEEN '15-Jan-2011' AND '20-Jan-2011'
ORDER BY StartDate

Note: the stripping of the time from the date came from here