Hi,
I have a table:
HOST_ID | ContractYear
1 | 2008
2 | 2008
3 | 2008
1 | 2009
4 | 2009
What I need is a query that will tell me all the HOST_ID's that are in 2009 that are not in 2008.
The answer in the example above is HOST_ID=4.
Thanks.