SQL query to select dates between two dates

Question

I have a start_date and end_date. I want to get the list of dates in between these two dates. Can anyone help me pointing the mistake in my query.

select Date,TotalAllowance  from Calculation  where EmployeeId=1   and Date between 2011/02/25 and 2011/02/27 

Here Date is a datetime variable.

Answer 1

you should put those two dates between single quotes like..

select Date, TotalAllowance from Calculation where EmployeeId = 1              and Date between '2011/02/25' and '2011/02/27' 

or can use

select Date, TotalAllowance from Calculation where EmployeeId = 1              and Date >= '2011/02/25' and Date <= '2011/02/27' 

keep in mind that the first date is inclusive, but the second is exclusive, as it effectively is '2011/02/27 00:00:00'

Answer 2

Since a datetime without a specified time segment will have a value of date 00:00:00.000, if you want to be sure you get all the dates in your range, you must either supply the time for your ending date or increase your ending date and use <.

select Date,TotalAllowance from Calculation where EmployeeId=1  and Date between '2011/02/25' and '2011/02/27 23:59:59.999' 

OR

select Date,TotalAllowance from Calculation where EmployeeId=1  and Date >= '2011/02/25' and Date < '2011/02/28' 

OR

select Date,TotalAllowance from Calculation where EmployeeId=1  and Date >= '2011/02/25' and Date <= '2011/02/27 23:59:59.999' 

DO NOT use the following, as it could return some records from 2011/02/28 if their times are 00:00:00.000.

select Date,TotalAllowance from Calculation where EmployeeId=1  and Date between '2011/02/25' and '2011/02/28'