Question

I’ve got a database that stores when users subscribed and unsubscribed from a service. What I want to do is see who unsubscribed each month, and then see how many of those people had unsubscribed within 30 days of subscribing. I have two fields, DateJoined_ and DateUnsub_ that both return a smalldatetime. How would I be able to find these people using DateJoined and DateUnsub? I know I have to do some sort of calculation, and I could do this easily if I wasn’t using SQL – any suggestions?

Answer 1

SELECT *
FROM UserTable
WHERE DATEDIFF(day, DateJoined, DateUnSub) <= 30

http://msdn.microsoft.com/en-us/library/ms189794.aspx