根據訂單狀態更新列

Question

輸入：

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

一家披薩公司正在接受客戶的訂單，每個披薩訂單都作為一個單獨的訂單添加到他們的數據庫中，每個訂單都有一個關聯的狀態“創建或提交或交付”。 最終狀態是根據狀態計算的，如下所示

當客戶的所有訂單的狀態為已交付時，客戶訂單的最終狀態為“已完成”

如果客戶有一些未交付的訂單和一些已交付的訂單，則最終狀態為“進行中”

如果所有客戶訂單都已提交，則最終狀態為“等待進度”

否則最終狀態為“等待提交”

期望的輸出：

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

Answer 1

這是一種方法：

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

您可以旋轉結果，例如：

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

但是您應該注意，在您的問題中，David 所需的輸出是 IN PROGRESS，但根據邏輯定義，對於此輸出，他應該有一個已交付的訂單。

Answer 3

披薩訂單狀態

按客戶名稱排序結果。

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;