Home/ Questions/Q 52017
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-05-10T16:50:28+00:00

I have a multi-table query, similar to this (simplified version) SELECT columns, count(table2.rev_id) As

  • 0

I have a multi-table query, similar to this (simplified version)

SELECT columns, count(table2.rev_id) As rev_count, sum(table2.rev_rating) As sum_rev_rating  FROM table1 LEFT JOIN table2 ON table1.dom_id = table2.rev_domain_from  WHERE dom_lastreview != 0 AND rev_status = 1  GROUP BY dom_url  ORDER BY sum_rev_rating/rev_count DESC

The problem is in the ORDER BY clause. This causes a MySQL error to show, which is as follows:

Reference ‘sum_ rev_ rating’ not supported (reference to group function)

Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. You’re not able to do calculations with aliases. One way of doing this would be to simply create another alias and order by that.

    SELECT columns, count(table2.rev_id) As rev_count, sum(table2.rev_rating) As sum_rev_rating, sum(table2.rev_rating)/count(table2.rev_id) as avg_rev_rating FROM table1 LEFT JOIN table2 ON table1.dom_id = table2.rev_domain_from  WHERE dom_lastreview != 0 AND rev_status = 1  GROUP BY dom_url  ORDER BY avg_rev_rating DESC
    • 0