Here's almost complete version of the query. For simplicity I used only one key field "Room". It shouldn't be hard to add "hall" and "period".

SELECT
		 s11.lastname AS lastname1, 
		 s11.firstname AS firstname1, 
		 s12.lastname AS lastname2, 
		 s12.firstname AS firstname2, 
		 s11.room
	FROM (
SELECT room, sid1, 
		CASE WHEN sid2<>sid1 THEN sid2 ELSE Null END AS sid2 
	FROM (
SELECT DISTINCT s1.Room, 
	(SELECT TOP 1 StudentId FROM students s2
		WHERE s2.room = s1.room
		ORDER BY StudentId) AS Sid1,
	(SELECT TOP 1 StudentId FROM students s3
		WHERE s3.room = s1.room
		ORDER BY StudentId DESC) AS sid2
	FROM students s1) d1) d2 
	JOIN Students s11 on d2.sid1 = s11.StudentId And d2.room = s11.room
	LEFT JOIN Students s12 on d2.sid2 = s12.StudentId And d2.room = s12.room

I'm not sure if it's "the best" solution but it produces correct result.

>I posted a message on the VFP forum but I think I might have better luck here.
>
>I have a table of students. In this table, there is a name and room they are staying in.
>
>I want a query that returns one row for each room that has 2 fields in that row of the names of both people staying in that room. There can only 0, 1 or 2 people in a room. So if one person was in a room, it would return null for the other name.
>
>This is what I have so far.
>
>select s1.lastname, s1.firstname, s2.lastname as lastname2, s2.firstname as firstname2, s1.room
>from students s1 inner join students s2 on s1.hall=s2.hall and s1.room=s2.room and s1.periodid=s2.periodid and s1.studentid<>s2.studentid
>where s1.hall = 'BREESE' and s1.periodid=4
>order by s1.room
>
>This almost works, However there is 2 records for each room. The difference between them is the names. Like this:
>
>Name1 Name2 Room
>XXX YYY 101
>YYY XXX 101
>
>I just want one or the other, not 2 for each room. Any ideas? TIA
>
>
>Eric Stephani