Question

I have a table that records when a user logs in.
I want to find all the users that have logged in within the last year.

So, simplified I have

|  Client_ID  |  DateLoggedIn  |
|      1      |    05/02/10    |
|      2      |    14/05/11    |
|      1      |    26/05/11    |
|      3      |    18/04/10    |
|      2      |    21/12/11    |

I’m trying to return the ClientID with the most recent date
eg:

|  Client_ID  |  DateLoggedIn  |
|      1      |    26/05/11    |
|      2      |    21/12/11    |
|      3      |    18/04/10    |

I have tried using Group By and tried the UNION join, but I think I’m doing something wrong…

All help gratefully received !!!

Thanks folks 🙂

Answer 1

Similar to the other Mark:

select Client_ID, max(DateLoggedIn)
from table
where DateLoggedIn > X /* X = one year ago - derivation will be DB-dependant */
group by Client_ID
order by max(DateLoggedIn) desc