如何更新連接和分組？

Question

我想要做這樣的查詢：

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

我將如何做到這一點？ （它說，該組織將是一個錯誤）

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

簡短的回答是：

更新狀態LEFT JOIN操作在Actions.id = State.id SET持續時間= FLOOR（AVG（持續時間））其中Actions.id IN（從動作中選擇id，其中Actions.id = state.id和type ='started'GROUP BY Actions.id）

可能在語法上不完全正確。