SQL statement to generate a table of totals by month - sql

Question

I am very unfamiliar with advanced SQL.
Lets say I have the following table (in Access - using Jet 4.0 OLEDBAdapter in VB.NET).
Table - Items
ID Date Account Amount
----- ------ ------- ------
1 1/1/2013 Cash 10.00
2 2/1/2013 Cash 20.00
3 1/2/2013 Cash 30.00
4 2/2/2013 Cash 40.00
5 1/1/2013 Card 50.00
6 2/1/2013 Card 60.00
7 1/2/2013 Card 70.00
8 2/2/2013 Card 80.00
And I want to generate the following - totals for each account per month
Table - Totals
Account Jan Feb
----- ----- ------
Cash 30.00 70.00
Card 110.00 150.00
Is this possible using one SQL statement. I can do it in two but it is very slow.
Edit - the closest I have got is this - but it doesn't generate columns
SELECT accFrom, Sum(amount)
FROM Items
WHERE Year(idate) = '2012'
GROUP BY Month(idate), accFrom

Answer 1

Using your sample data, this is the output I got from the query below with Access 2010.
Account 2013-01 2013-02
------- ------- -------
Card $120.00 $140.00
Cash $40.00 $60.00
My totals don't match your expected output. I suspect your date values were d-m-yyyy format, but my US locale interpreted them as m-d-yyyy. It's better to present dates in yyyy-m-d format to avoid that confusion.
Anyway this query formats the dates as yyyy-mm, and then pivots to generate the columns for each year-month combination. So it will accommodate a growing date range without requiring you to modify the query. And, as the date range grows, you could eventually add a WHERE clause to limit to columns to a convenient subset.
TRANSFORM Sum(i.Amount) AS SumOfAmount
SELECT i.Account
FROM Items AS i
GROUP BY i.Account
PIVOT Format(i.Date,'yyyy-mm');

Answer 2

Since there are exactly 12 months in a year, you do not need to pivot; just calculate the sum for each month:
SELECT Account,
Sum(IIF(Month(Date)=01, Amount, 0)) AS Jan,
Sum(IIF(Month(Date)=02, Amount, 0)) AS Feb,
Sum(IIF(Month(Date)=03, Amount, 0)) AS Mar,
Sum(IIF(Month(Date)=04, Amount, 0)) AS Apr,
Sum(IIF(Month(Date)=05, Amount, 0)) AS May,
Sum(IIF(Month(Date)=06, Amount, 0)) AS Jun,
Sum(IIF(Month(Date)=07, Amount, 0)) AS Jul,
Sum(IIF(Month(Date)=08, Amount, 0)) AS Aug,
Sum(IIF(Month(Date)=09, Amount, 0)) AS Sep,
Sum(IIF(Month(Date)=10, Amount, 0)) AS Oct,
Sum(IIF(Month(Date)=11, Amount, 0)) AS Nov,
Sum(IIF(Month(Date)=12, Amount, 0)) AS "Dec"
FROM Items
WHERE Year(Date) = 2013
GROUP BY Account

Answer 3

Goose is right, you'll need to pivot on your Date column and use SUM() as the aggregate.
The syntax will look something similar to:
SELECT account, [1/1/2013] as jan, [2/1/2013] as feb, ... -- each month you want to select
FROM
(
SELECT date, account, amount FROM items
)
PIVOT
(
SUM(amount) FOR date IN
(
[1/1/2013], [2/1/2013], ... -- each date you want to have its own column
)
) AS pvt