Question

以下查询的结果遇到一些问题。

我的意图是显示主机收到的总付款的结果，并根据汇总列（以“已收到的总金额（$）”为别名）以降序排列。

Select   H.host_name AS 'Host Name', 
         H.location AS 'District', 
         AVG(F.host_feedback_rating) AS 'Average Rating',
         SUM(P.payment_amount) AS 'Total Amount Received ($)'

FROM booking B, host H, payments P, feedback F 
WHERE H.host_id = P.host_id
AND F.booking_code = B.booking_code
AND F.host_id = H.host_id
AND P.payment_date  between '2018/01/01' and '2018/12/31'

GROUP BY 1,2
ORDER BY 'Total Amount Received ($)' DESC;

当前结果：

Host Name   District    Average Rating  Total Amount Received ($)
John         Detroit              5                275
Leeroy       Chicago              5                50
Rinoa        Texas                5                225
Sally        California           4                45

我曾尝试调整GROUP BY子句，但总收款（$）不能以某种方式正确排序...您能对此进行指导吗？

非常感谢您！

Answer 1

'Total Amount Received ($)'用单引号（'）包围，因此是常量字符串文字。按照技术进行排序虽然在技术上没有错（如您所见-没有错误），但它毫无意义，因为所有行的常量值都相同。

最简单的方法，恕我直言，将根据列的索引而不是别名进行排序：

ORDER BY 4 DESC

Answer 2

尝试反引号

...ORDER BY `Total Amount Received ($)` DESC

OR

...Order By 4 DESC

或

...SUM(P.payment_amount) DESC

谢谢：）

无法使用具有汇总字段的Order by和Group By函数对SQL查询结果进行排序

2 个答案: