MySQL 可以进行单查询吗？

Question

我有一个 MySQL 语句:

SELECT name, ((AVG (q1) + AVG(q2) + AVG(q3) / 3) AS Average 
FROM tresults GROUP BY name ORDER BY name;

我还有另一个MySQL语句:

SELECT name, ((AVG (q1) + AVG(q2) + AVG(q3) / 3) AS Average 
FROM tresults WHERE q35 = 1 GROUP BY name ORDER BY name;

我尝试过使用子查询，但由于它返回不止一行，因此以下代码不起作用:

SELECT name, ((AVG (q1) + AVG(q2) + AVG(q3) / 3) AS Average,
  (SELECT ((AVG (q1) + AVG(q2) + AVG(q3) / 3) 
  FROM tresults WHERE q35 = 1 GROUP BY name ORDER BY name ) AS Average2  
FROM tresults GROUP BY name ORDER BY name;

这可能吗？声明的结构会是什么样子？

预先感谢您提供的所有反馈和建议。

Answer 1

SELECT name, 
       (AVG (AVG (q1) + AVG(q2) + AVG(q3) / 3) AS Average,
       (AVG (AVG (case when q35 = 1 then q1 else 0 end) + 
            (AVG (case when q35 = 1 then q2 else 0 end) + 
            (AVG (case when q35 = 1 then q3 else 0 end) / 3) AS q35_Average
FROM tresults 
GROUP BY name 
ORDER BY name