Question

I have a table that lists service calls for employees. i have a view set up to view the sum of the invoices in the table.

Select EmployeeID, SUM(InvoiceAmount) as "Total $ Amount Of Calls For January"
From Calls
WHERE Date BETWEEN '2013/01/01' AND '2013/01/31'
Group by EmployeeID

this works great but i have to do it twelve times to view each month and this seems a bit redundant. i would like to be able to use a sub query to display EmployeeID and then list each month with totals underneath.

EmployeeID   JAN   FEB   MAR   APR ...
john         444   555   342   654
jim          945   675   232   465

ive tried a bunch of things and cant get even close…i need something like this, but that works…

SELECT   
EmployeeID, 

(SELECT SUM(InvoiceAmount) FROM Orders WHERE DATE BETWEEN '2013/01/01' AND '2013/01/31') AS JAN,

(SELECT SUM(InvoiceAmount) FROM Orders WHERE DATE BETWEEN '2013/02/01' AND '2013/02/28') AS FEB,

(SELECT SUM(InvoiceAmount) FROM Orders WHERE DATE BETWEEN '2013/03/01' AND '2013/03/31') AS MAR,

FROM Calls

Answer 1

You can do something like this:

SELECT EmployeeID, 
    SUM(
        CASE
            WHEN strftime('%m', Date) = '01'
                THEN InvoiceAmount
            ELSE 0
        END) AS 'Jan',
    SUM(
        CASE
            WHEN strftime('%m', Date) = '02'
                THEN InvoiceAmount
            ELSE 0
        END) AS 'Feb',
    ...
    SUM(
        CASE
            WHEN strftime('%m', Date) = '12'
                THEN InvoiceAmount
            ELSE 0
        END) AS 'Dec'
FROM Calls
WHERE Date BETWEEN '2013-01-01' AND '2013-12-31'
GROUP BY EmployeeID

This works well if you’re looking at a particular year.

See it in action