Question

I am build a report, the output should be like (example):

['11/2012', 5, 2, 0]
['10/2012', 7, 1, 0]
['09/2012', 2, 3, 0]
['08/2012', 0, 0, 1]
['07/2012', 0, 2, 1]
['06/2012', 2, 1, 0]
['05/2012', 3, 1, 1]
['04/2012', 2, 2, 1]
['03/2012', 5, 0, 0]
['02/2012', 7, 1, 0]
['01/2012', 2, 0, 0]
['12/2011', 3, 0, 1]

For the month part, I need to get the actual month and than list one year back. I have done this with this code:

<%
    DataAtual_PeriodoInicial= Now
    DataFinal_PeriodoInicial= DateAdd("m", -13, Now)
    DO WHILE Datediff("m", DataAtual_PeriodoInicial, DataFinal_PeriodoInicial) <> 0
%>
    ['<% Response.Write(Right("0" & Month(DataAtual_PeriodoInicial), 2)) %>/<% Response.Write(Year(DataAtual_PeriodoInicial)) %>', X, Y, Z]<br>
<%
    DataAtual_PeriodoInicial= DateAdd("m", -1, DataAtual_PeriodoInicial)
    LOOP
%>

So this is generating:

['11/2012', X, Y, Z]
['10/2012', X, Y, Z]
['09/2012', X, Y, Z]
['08/2012', X, Y, Z]
['07/2012', X, Y, Z]
['06/2012', X, Y, Z]
['05/2012', X, Y, Z]
['04/2012', X, Y, Z]
['03/2012', X, Y, Z]
['02/2012', X, Y, Z]
['01/2012', X, Y, Z]
['12/2011', X, Y, Z]

Now I have to throw some numbers instead of X, Y, and Z. I have a table with data like:

11  2012    X
10  2012    X
10  2012    X
10  2012    X
10  2012    Y
10  2012    Y
10  2012    Z
10  2012    Z
10  2012    Z
9   2012    X
9   2012    X
9   2012    X
9   2012    Y
9   2012    Z
9   2012    Z
8   2012    X
8   2012    X
8   2012    Y
8   2012    Y
8   2012    Y
8   2012    Y
8   2012    Y
...

And I start with this select:

SELECT
    datepart(month,SentDate) AS Mes,
    datepart(year,SentDate) AS Ano,
    EventType
FROM
    SomeTable
ORDER BY
    SentDate DESC

I tried some group by, but didn’t sucessed. Do I need some kind of Count? SUM? And how can i finish the come to have the output like the one in the top of this question?

Thanks!

Answer 1

Try this

SELECT
    datepart(month,SentDate) AS Mes,
    datepart(year,SentDate) AS Ano,
    sum(CASE WHEN EventType = 'X' THEN 1 ELSE 0 END ) X,
    sum(CASE WHEN EventType = 'Y' THEN 1 ELSE 0 END ) Y,
    sum(CASE WHEN EventType = 'Z' THEN 1 ELSE 0 END ) Z
FROM
    SomeTable
GROUP BY
    datepart(month,SentDate),
    datepart(year,SentDate)
ORDER BY
    Ano DESC,
    Mes DESC
    SentDate DESC

Demo at http://sqlfiddle.com/#!3/93a11/23/0

---

You could also use a PIVOT table

SELECT * FROM
  (
  SELECT 
    datepart(month,SentDate) AS Mes,
    datepart(year,SentDate) AS Ano,
    EventType
  FROM 
    SomeTable
 ) grouped
PIVOT (COUNT(eventType) for EventType in ([X],[Y],[Z])) AS pivoted
ORDER BY
  Ano DESC,
  Mes DESC

Demo at http://sqlfiddle.com/#!3/93a11/16/0