CTE 无法对多列中的空白列求和

Question

我想为每一行计算 total_revenue 列，但 cte 没有这样做。我得到的 pr 列在几个月内都是空的，并且对其中的一些有价值。所以我得到一个 total_revenue ，其中 pr 列不为空。我做错了什么？

ormonth     cc_o    cc_r      po    pr  po_o    po_r    total_orders    total_revenue
2018-06     1367    152903.89   0       44     6424.66    1411  
2018-05     10069   1086544.02  0       242    27926.02   10311 
2018-04     11208   1151114.03  0       221    26004.69   11429 
2018-01     13416   1379387.01  0       152    17023.29   13568 
2018-03     12025   1303165.8   0       197    19957.87   12222 
2018-02     12647   1252867.33  0       171    16907.52   12818 
2018-01     145     1100.43     6  121  170    1600       321                2822

这是我使用的查询：

with cte_Revenue as (
SELECT
    CONVERT(VARCHAR(7),Orders.OrderDate,126) as ormonth,
 COUNT(CASE WHEN Orders.paymentmethodid = 5 OR Orders.paymentmethodid = 6 THEN Orders.PaymentAmount END) as 'CC_O',
 SUM(CASE WHEN Orders.paymentmethodid = 5 OR Orders.paymentmethodid = 6 THEN Orders.PaymentAmount END) as 'CC_R',

COUNT(CASE WHEN Orders.paymentmethodid = 25 THEN Orders.paymentmethodid END) as 'PO',
 SUM(CASE WHEN Orders.paymentmethodid = 25 THEN Orders.PaymentAmount  END ) as 'PR',

COUNT(CASE WHEN Orders.paymentmethodid = 1 THEN Orders.paymentmethodid END) as 'PO_O',
 SUM(CASE WHEN Orders.paymentmethodid = 1 THEN Orders.PaymentAmount END ) as 'PO_R'
FROM
    Orders
WHERE
    Orders.OrderDate BETWEEN '01/01/2018' AND getdate() -0 AND
    Orders.OrderStatus <> 'Cancelled'
GROUP BY
    CONVERT(VARCHAR(7),Orders.OrderDate,126))
Select 
ormonth,
CC_O,
CC_R,
PO,
PR,
PO_O,
PO_R,
(CC_O+PO+PO_O) AS Total_Orders,
(CC_R+PR+PO_R) AS Total_Revenue
FROM cte_Revenue

Answer 1

看起来 PR 列可能 returning NULL，这将导致无法执行计算。正如我在评论中提到的，也许 SELECT 中的 CASE 语句可以解决这个问题。

SELECT ormonth, CC_O, CC_R, PO, PR, PO_O, PO_R, 
       (CC_O + PO + PO_O) AS Total_Orders, 
       (CC_R + CASE WHEN PR IS NULL THEN 0 ELSE PR END + PO_R) AS Total_Revenue
FROM   cte_Revenue

另一种选择是确保在 CTE 中，PR 列始终具有值。在 CTE 中放入 return 0 的 ELSE 语句也可能有所帮助。

例如：

 COUNT(CASE WHEN Orders.paymentmethodid = 1 THEN Orders.paymentmethodid 
            ELSE 0 END) as 'PO_O',
 SUM(CASE WHEN Orders.paymentmethodid = 1 THEN Orders.PaymentAmount  
            ELSE 0 END ) as 'PO_R'

CTE 无法对多列中的空白列求和

CTE not able to sum blank columns out of multiple columns

sql-server-2005

common-table-expression