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

SELECT SUM(count1), SUM(count2), SUM(count3), MONTH(month)
  FROM myTable
 GROUP BY MONTH(month)

Since MONTH is an SQL Server keyword, you might have to escape the column name month (e.g. [month]), if you date column is really called like that. (Thanks Endy for that comment!)

Also, if data selected span more than one year, you will probably need to group by year as well:

SELECT SUM(count1), SUM(count2), SUM(count3), MONTH(month), YEAR(month)
  FROM myTable
 GROUP BY MONTH(month), YEAR(month)

Answer 2

SELECT
SUM(count1) as sum_count1,
to_char(month, 'yyyy-MM') as month
FROM
dataframe 
GROUP BY
month

Answer 3

reduce the query burden

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

Answer 4

SELECT SUM(count1), SUM(count2), SUM(count3), MONTH(month)   
FROM Table  
GROUP BY trunc(month,'mm')

This will run in PL/SQL developer :)