Question : How do I take a totals query and update a column in another table?

I have the following query:

SELECT tblUpRooms.Room_Number, Count(PROJ_EQ.Equip) AS CountOfEquip
FROM tblUpRooms INNER JOIN PROJ_EQ ON tblUpRooms.Room_Number = PROJ_EQ.Room_Number
GROUP BY tblUpRooms.Room_Number;

It totals how many equip is in each room with each corresponding room number.

I want to take that data and update a specific column in my table:  tblUpRooms with the field TotEquip.
What kind of SQL statement would allow me to do that?

Answer : How do I take a totals query and update a column in another table?

I suspect that you're wanting to do something like

UPDATE tblUpRooms SET TotEquip = DCount("*", "PROJ_EQ", "Room_Number = " & [Room_Number])
FROM tblUpRooms

But that would be a violation of normalisation and a pain to maintain.
(btw DCount is the doman aggregate in this example).