Question

I’m currently trying to create a T-SQL, which runs through a list of deliveries in a table, and groups them by the Customer and the Depot – so each row will be

Customer, Depot, Total Value (sum of a column called Rate)

However, the customer would like the ‘total value’ split into the last 9 weeks – so rather than total value, we’ll have columns like this:

22/01/2012  29/01/2012  05/02/2012  12/02/2012  19/02/2012  26/02/2012  04/03/2012  11/03/2012  18/03/2012

The dates would of course change for when they run the query – it’ll just be the last 9 weeks. They also want a column for the Average of all these.

I understand pivot may help me but I’m a bit stumped on how to do this. Here’s my current query:

SELECT d.Name AS 'Depot, s.Name AS 'Customer', SUM(c.Rates) AS 'Total Value'
FROM Deliveries AS c INNER JOIN Account AS s ON c.Customer = s.ID
INNER JOIN Depots AS d ON c.CollectionDepot = d.Letter
GROUP BY d.Name, s.Name

Many thanks!

EDIT: Here’s a screenshot of the data currently – we won’t need the ‘total’ column on the end, just there to show you. The ‘Date’ column is present in the Deliveries table and is called TripDate

Answer 1

You would have to make use of the PIVOT Keyword which is available in your version of SQL Server. I have outlined how your query should look, of course some tweaking will be required since it is difficult to test without having a copy of your data.

  SELECT Depots.Name AS 'Depot',  Account.Name, '22/01/2012',  '29/01/2012',  '05/02/2012',  '12/02/2012',
   FROM 
(SELECT Name, 
    FROM Deliveries
    INNER JOIN Account ON Deliveries.Customer = Account.ID
    INNER JOIN Depots ON Account.CollectionDepot) AS Source
PIVOT
(
    SUM(Deliveries.Rates)
    FOR Date IN ('22/01/2012',  '29/01/2012',  '05/02/2012',  '12/02/2012')
) AS 'Pivot Table'

For reference you could use this as a guide:

http://msdn.microsoft.com/en-us/library/ms177410.aspx