SQL Update语句在where子句相同的表中带有子查询

Question

我目前是一名学生，我正在尝试解决SQL的一个小问题。 我想根据来自同一张表的过滤结果在一张表上执行更新语句。 这是我的桌子：

这是我到目前为止的查询：

UPDATE ComplexityLessons
SET ACADEMYRATIO = '0,896' 
WHERE (
    SELECT c.START, c.DATE, c.ACTIVITY, c.ACADEMY
from ComplexityLessons c
join (
    SELECT b.ACTIVITY, b.START, b.DATE
    FROM ComplexityLessons b
) as b 
on c.ACTIVITY = b.ACTIVITY and c.DATE = b.DATE and c.START = b.START
having COUNT(DISTINCT ACADEMY) = 2)

因此，总而言之，我只想在两个学院同时进行相同活动的地方更新“ ActivityRatio”列。 当我仅使用子查询时，我会获得同时执行相同活动的学院，但是我无法弄清更新语句。 预先感谢您的帮助 ！

Answer 1

UPDATE ComplexityLessons SET ACADEMYRATIO = '0,896' 
WHERE ( SELECT c.START, c.DATE, c.ACTIVITY, c.ACADEMY 
        from ComplexityLessons c 
join ( SELECT b.ACTIVITY, b.START, b.DATE 
       FROM ComplexityLessons b ) as b 
on c.ACTIVITY = b.ACTIVITY and c.DATE = b.DATE and c.START = b.START 
having COUNT(DISTINCT ACADEMY) = 2)

应该在哪里具有条件，子查询应返回ID。 例如

UPDATE ComplexityLessons SET ACADEMYRATIO = '0,896'
WHERE <id> in ( SELECT <id> from ComplexityLessons c 
join ( SELECT b.ACTIVITY, b.START, b.DATE 
       FROM ComplexityLessons b ) as b 
on c.ACTIVITY = b.ACTIVITY and c.DATE = b.DATE and c.START = b.START 
having COUNT(DISTINCT ACADEMY) = 2)

应该是表之间的前键。