SQL needed: sum over values by month

Question

i have an table with values like this:

count1   count2  count3  month
12        1       4       01/12/2011
6         5       4       23/12/2011
14                 


        

Answer 1

reduce the query burden

SELECT SUM(count1), SUM(count2), SUM(count3), substring(month,4,2)   
FROM myTable  
GROUP BY substring(month,4,2)