使用带汇总字段的Order by和Group By函数对SQL查询结果进行排序时遇到麻烦

Question

I am encountering some issues with the results of the following query.

My intention is to display the results of the total payments received by the hosts, sorted in descending order based on the aggregated column (aliased as 'Total Amount Received ($)'

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;

Current Results:

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

I've tried adjusting the GROUP BY clauses, but somehow the Total Amount Received ($) does not get sorted correctly... Could you please guide me on this?

Thank you very much!

Answer 1

'Total Amount Received ($)' is surrounded by single quotes ( ' ), and is thus a constant string literal. While sorting according to it isn't technically wrong (as you could see - you got no error), it's meaningless, as all the rows would have the same value of the constant.

The easiest approach, IMHO, would be to sort according to the column's index instead of its alias:

ORDER BY 4 DESC

Answer 2

try with backtick like

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

OR

...Order By 4 DESC

or

...SUM(P.payment_amount) DESC

Thanks :)