如何更新连接和分组？

Question

我想要做这样的查询：

UPDATE State 
LEFT JOIN Actions ON Actions.id = State.id 
SET duration = FLOOR(AVG(duration)) WHERE type = 'started' GROUP BY Actions.id 

我将如何做到这一点？ （它说，该组织将是一个错误）

Answer 1

UPDATE State 
INNER JOIN 
(
    select id, FLOOR(AVG(duration)) as avg 
    from Actions 
    WHERE type = 'started' 
    group by id   
) tmp ON tmp.id = State.id 
SET duration = tmp.avg 

Answer 2

简短的回答是：

更新状态LEFT JOIN操作在Actions.id = State.id SET持续时间= FLOOR（AVG（持续时间））其中Actions.id IN（从动作中选择id，其中Actions.id = state.id和type ='started'GROUP BY Actions.id）

可能在语法上不完全正确。