select MAX(date) with associate value [duplicate] - mysql

Question

This question already has answers here:
SQL select only rows with max value on a column [duplicate]
(27 answers)
Closed 6 years ago.
I have two tables. One is basic customer information and one is ordering information.
I'm trying to find the max(order date) with the order status of 'placed'or'cancelled'. I don't care if the status if placed or cancelled. I just want the most recent order.
The first table (Info)
CustomerID LAST NAME FIRST NAME
1 AB BOB
2 BC ROBERT
3 AA JOHN
The second table(order)
CustomerID Order Date Order Status
1 12/16/2016 placed
2 8/5/2016 cancelled
1 5/8/2015 cancelled
2 8/9/2016 placed
3 7/15/2016 cancelled
3 8/20/2015 placed
I want the result to be:
CustomerID FirstName LastName OrderDate OrderStatus
1 AB BOB 12/16/2016 placed
2 BA ROBERT 8/9/2016 placed
3 AA JOHN 7/15/2016 cancelled
Here are my SQL syntax
SELECT distinct Info.CustomerID, Info.Lastname,Info.Firstname
FROM INFO
INNER JOIN
(SELECT
order.CustomerID, LastOrderDate=max(OrderDate),order.OrderStatus
FROM Order
GROUP BY order.CustomerID, order.orderstatus)a
ON a.CustomerID=Info.CustomerID
This didn't work because it's grouping by order status which give me the max date of each all orderstatus. Then I tried
SELECT distinct Info.CustomerID, Info.Lastname,Info.Firstname, Order.OrderStatus
FROM INFO, Order
INNER JOIN
(SELECT
order.CustomerID, LastOrderDate=max(OrderDate)
FROM Order
GROUP BY order.CustomerID)a
ON a.CustomerID=Info.CustomerID
This didn't work either because it says the Info.CustomerID could not be bound.
Any helps? Thanks!

Answer 1

Can you try the following query:
SELECT c.customerid, c.last_name, c.first_name, o.order_status, MAX(order_date)
FROM customer c JOIN order ON c.customerid = o.customerid
WHERE o.order_status IN ('placed', 'cancelled')
GROUP BY c.customerid, c.last_name, c.first_name, o.order_status;
update
If you don't want the max date by order status then you can remove it from group by, e.g.:
SELECT c.customerid, c.last_name, c.first_name, MAX(order_date)
FROM customer c JOIN order ON c.customerid = o.customerid
WHERE o.order_status IN ('placed', 'cancelled')
GROUP BY c.customerid, c.last_name, c.first_name;
Another update
Following query would return both the records if an order gets placed and cancelled on the same day:
SELECT c.customerid, c.first_name, c.last_name, o.order_date, o.order_status
FROM customer c JOIN
(SELECT o1.customerid, o1.order_date, o1.order_status
FROM `order` o1 JOIN
(SELECT o.customerid, max(o.order_date) as max_date
FROM `order` o
WHERE o.order_status in ('placed', 'cancelled')
GROUP BY o.customerid) o2
ON o1.customerid = o2.customerid and o1.order_date = o2.max_date) o
ON c.customerid = o.customerid;
Here's the SQL Fiddle.