Retrieving only one row where the date is the greatest.

Question

Hello;
I have a table of received orders, sometimes each order has multiple receipts due to back-orders and thus several rows for each purchase order receipt. All of the values in the table are identical except for the ReceivedDate field.
I need to only get the row that has the latest ReceivedDate so I can ascertain whether the shipment has been received on-time or if it is late. For example, if I have a promised date from my vendor of 2015-01-31 for 50 widgets. I receive 40 widgets on 2015-01-29
another 5 on 2015-01-31 and the last 5 on 2015-02-01, the entire shipment is considered to be late because I got my last widgets past the promised date.
In my report, I don't care about the quantity received, I only care about when they were received Vs the promised date.
So how can I only get the row that has the latest date (2015-02-01 in my example) so that I can do my on-time comparison?
Appreciate any and all help.
Thanks Ron...

Answer 1

Hi, assuming to work in AdentureWorks db you can execute this script
use AdventureWorks2012
go
select
CustomerId,
orderdate,
max(orderdate) over (partition by CustomerId) as maxOrderDateForCustomer
from sales.SalesOrderHeader
to search all the order for each CustomerId and compare the date of each order with tha max date of all customer's orders.
Hope this will help you
Best regards
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