Question

I want to make a query that returns the most recent sales order for a customer.

I have a Customers and and an Orders table that are joined on ID, and i’ve made the following query to return all values. Can anyone help me modify it to only return the latest value for each ID? Orders.created_at is formatted like so yyyy-MM-dd HH:mm:ss

SELECT Customers.ID, Customers.Name, Customers."Sales Responsible US", Customers."Sales     Responsible", Customers."Website", ISNULL(Orders.row_invoiced, '-1'), Orders.status, Orders.created_at
FROM "Customers"
LEFT JOIN Orders
On Customers.ID=Orders.customer_id

Answer 1

Try this ::

   SELECT Customers.ID, 
Customers.Name, 
Customers."Sales Responsible US", 
Customers."Sales     Responsible", 
Customers."Website", 
IFNULL(Orders.row_invoiced, '-1'), 
Orders.status, MAX(Orders.created_at)
    FROM "Customers"
    LEFT JOIN Orders On Customers.ID=Orders.customer_id

    group by Orders.customer_id