基本SQL聚合

我有两个表：runner（r_name（主键）、miles、week_id）和WEEKDAYS（did、day_of_week）。 runner.week_id引用了Weekdays.did

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如何查找平均英里数最长的一周中的哪一天？

创建一个内部查询，该查询使用分组跑步者进入一周中的哪一天。使用“带限制的订单”按周\ id选择顶部条目。然后选择具有该id的周：

SELECT *
FROM weekdays
WHERE
week_id IN (
  SELECT week_id
  FROM runner
  GROUP BY week_id
  ORDER BY SUM(miles) DESC
  LIMIT 1
)

使用联接：

SELECT *
FROM weekdays
JOIN runner
ON runner.week_id = weekdays.id
GROUP BY runner.week_id
ORDER BY SUM(runner.miles) DESC
LIMIT 1

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创建一个内部查询，该查询在星期几使用组。使用“带限制的订单”按周\ id选择顶部条目。然后选择具有该id的周：

SELECT *
FROM weekdays
WHERE
week_id IN (
  SELECT week_id
  FROM runner
  GROUP BY week_id
  ORDER BY SUM(miles) DESC
  LIMIT 1
)

使用联接：

SELECT *
FROM weekdays
JOIN runner
ON runner.week_id = weekdays.id
GROUP BY runner.week_id
ORDER BY SUM(runner.miles) DESC
LIMIT 1

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如何编写没有子查询的查询？如何编写没有子查询的查询？