How can I reduce multple dated rows into just the start and end dates of those particular values?

[mk000]

Say I have rows of people and their school, it can change over time, so I have many rows for each person, each with a start and end date...

ID Start Date End Date School
Mike 1/1/10 5/1/10 OSU
Mike 5/2/10 12/31/9999 PSU

Tom 1/1/10 4/1/10 OSU
Tom 4/2/10 6/30/10 OSU
Tom 7/1/10 5/1/10 OSU
Tom 5/2/10 12/31/9999 PSU


Bob 1/1/10 4/1/10 OSU
Bob 4/2/10 6/30/10 OSU
Bob 7/1/10 9/6/10 OSU
Bob 9/7/10 12/31/9999 OSU

What's the best way to turn multiple rows of data into just the start and end dates for the school and name combination?

So I want in the end...

Mike 1/1/10 5/1/10 OSU
Mike 5/2/10 12/31/9999 PSU
Tom 1/1/10 5/1/10 OSU
Tom 5/2/10 12/31/9999 PSU
Bob 1/1/10 12/31/9999 OSU

 

[alansidman]

Try this query. You will have to change the field names to match your field names and tables.

SELECT Table2.sName, Min(Table2.Begin) AS MinOfBegin, Max(Table2.End) AS MaxOfEnd, Table2.School
FROM Table2
GROUP BY Table2.sName, Table2.School;

Alan

 

[mk000]

The only thing is this does not work if I have movement from one school to another and back to the first school...

So

Ted 1/1/2000 12/31/2000 PSU
Ted 1/1/2001 12/31/2001 OSU
Ted 1/1/2002 12/31/9999 PSU


If take the begin min and the end max of each person/school

It'd look like this
Ted 1/1/2000 12/31/9999 PSU < THIS IS WRONG
Ted 1/1/2001 12/31/2001 OSU