Update the column according to order status

Question

INPUT:

CUSTOMER_NAME       ORDER_ID      STATUS
-----------------------------------------------
  john                j1          delivered
  john                j2          delivered
  david               d1          submitted
  david               d3          created
  smith               s1          submitted
  krish               k1          created

A pizza company is taking orders from customers and each pizza order is added to their database as a separate order each order has an associated status "CREATED or SUBMITTED or DELIVERED". final status is calculated bases on status as follows

When all orders for a customer have a status of DELIVERED that customers order has a final status of "COMPLETED"

If a customer has some orders that are not DELIVERED and some orders that are DELIVERED that final status is "IN PROGRESS"

If all of a customers orders are SUBMITTED the final status is "AWAITING PROGRESS"

Otherwise the final status is "AWAITING SUBMISSION"

Desired output:

CUSTOMER_NAME                 FINAL_STATUS
--------------------------------------------------
david                         IN PROGRESS
john                          COMPLETED
krish                         AWAITING SUBMISSION
smith                         AWAITING PROGRESS

Answer 1

here is one way:

select customer_name 
   , case when count(case when status <> 'created' then 1 end) = 0 then 'awaiting submission'  
          when count(case when status <> 'submitted' then 1 end) = 0 then 'awaiting progress'
          when count(case when status <> 'delivered' then 1 end) > 0 then 'In progress'
          when count(case when status <> 'delivered' then 1 end) = 0 then 'Completed'          
     end
from orders
group by customer_name

Answer 2

You can do it pivoting the results, like:

with pivoted as (
    SELECT *
    FROM orders
    pivot(
        count(order_id) for status in (
        [delivered], [submitted], [created])
    )as pv
)
SELECT
    p.CUSTOMER_NAME,
    CASE
    WHEN delivered>0 AND submitted=0 AND created=0  THEN 'COMPLETED'
    WHEN delivered>0 AND (submitted>0 OR created>0) THEN 'IN PROGRESS'
    WHEN delivered=0 AND submitted>0 AND created=0 THEN 'AWAITING PROGRESS'
    ELSE 'AWAITING SUBMISSION'
END AS FINAL_STATUS
FROM pivoted p

But you should note that in your question, the desired output for David is IN PROGRESS, but by the logic definition, for this output he should have a delivered order.

Answer 3

Pizza Order Status

Order the result by customer name.

select customer_name
   , case when count(case when status <> 'CREATED' then 1 end) = 0 then 'AWAITING SUBMISSION'  
          when count(case when status <> 'SUBMITTED' then 1 end) = 0 then 'AWAITING PROGRESS'
          when count(case when status <> 'DELIVERED' then 1 end) > 0 then 'IN PROGRESS'
          when count(case when status <> 'DELIVERED' then 1 end) = 0 then 'COMPLETED'          
     end
from customer_order
group by customer_name
ORDER BY customer_name ASC;