How to combine two sql queries into one

Question

How can I combine these two SQL statements?

SELECT SUM(hits01 + hits02 + hits03 + hits04 + hits05 + hits06 + hits07 + hits08 + hits09) AS 'AEROwiz'
FROM tbl_2011
WHERE appName='AEROwiz'

SELECT SUM(hits10 + hits11 + hits12) AS 'AEROwiz'
FROM tbl_2010
WHERE appName='AEROwiz'

hits10, hits11 and hits12 exist in both tables.

Answer 1

Use a UNION query - just stuff "UNION" between the two queries:

SELECT SUM(...) AS AEROWiz
FROM ...

UNION

SELECT SUM(...) AS AEROWiz
FROM ...

---

update

wrap the union in yet another query:

SELECT SUM(AEROWiz)
FROM (
    .... unioned queries here
) AS child