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 tb         


        

Answer 1

SELECT  SUM(hits01 + hits02 + hits03 + hits04 + hits05 + hits06 + 
hits07 + hits08 + hits09 + t2010.hits10 + t2010.hits11 + t2010.hits12) AS 'AEROwiz'
FROM tbl_2010 t2010
JOIN tbl_2011 t2011 ON t2010.appName = t2011.appName
WHERE t2010.appName='AEROwiz'

Answer 2

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

UNION ALL

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

Use UNION ALL as it will allow duplicates, and UNION will not put duplicates in the query result. With the SUM() aggregate, I'm guessing there's a good chance of duplication summations, so I'd go with UNION ALL for this one.

Answer 3

You could use two subselects:

SELECT
(
    SELECT SUM(hits01 + hits02 + hits03 + hits04 + hits05 + hits06 + hits07 + hits08 + hits09)
    FROM tbl_2011
    WHERE appName='AEROwiz'
) T1
+
(
    SELECT SUM(hits10 + hits11 + hits12)
    FROM tbl_2010
    WHERE appName='AEROwiz'
) T2
AS AEROwiz

You may also want to consider normalizing your database so that you don't have a table for each year.

Answer 4

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