I need to write a query that essentially does both a left and right join. I
have a list of people and the rooms they occupy. Some rooms have no people.
Some people have no room assigned.
This gives me a list of rooms and how many people are in each room
including any rooms with nobody in them:
select r.room_num, count(p.peopid)
from rooms r
left join people p on r.roomid=p.roomid1
group by r.room_num
All I need is one more row in the table with a null for the room num and a
count of the number of people with no room assigned. If I change 'left' to
'right' in the query above, I get that row but then I don't get rooms with
no people.
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