[thelist] MYSQL - join a table, to itself?

[Tris]

Ello all!
I've got a table that captures users activity on a points spending site.

my statement table has the follwoing fields:

date, points, calcType, userId

calcType is boolean, where 0 = -  AND 1 = +

What I've been asked to do is simply show 3 peices of data:
Total points added
Total poitns spent
Total points left over...

So, I've got a query
SELECT SUM(points) as earned
FROM `statement` as earnedTable
WHERE
earnedTable.calctype = 1

But I'm convinced there's gotta be away to join the table with itself
and get the calcType = 0 total too...
the final query, I just want 2 fields.. I can work out the thrid myself...

So, any ideas?

Tris...


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