我有一个多表查询，与此类似（简化版）
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
问题在于ORDER BY条款。这会导致显示 MySQL 错误，如下所示：
不支持引用“sum_ rev_ rating”（引用组函数）
您无法使用别名进行计算。执行此操作的一种方法是简单地创建另一个别名并按其排序。
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
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