MySQL查詢犯規給我同樣的結果，當我創建視圖

Question

select packages.id AS id, 
packages.co_id AS co_id, 
(select companies.name from companies where (packages.co_id = companies.id)) AS co_name, 
(select companies.tel from companies where (packages.co_id = companies.id)) AS tel, 
packages.datetime AS datetime, 
(select tracking.datetime from tracking where (packages.id = tracking.pid and action='tookit')) AS tooktime, 
(select tracking.datetime from tracking where (packages.id = tracking.pid and action='putit')) AS puttime, 
packages.status AS status from packages 

，因爲它應該當我運行它，但是當我做它作爲一個視圖犯規表現出同樣的結果，我得到的領域零點「這個查詢工作良好跟蹤」表

我重新查詢仍然有問題

SELECT t1.id , t1.co_id , t2.name, t2.tel, t1.datetime , t3.datetime as tookit, t4.datetime as putit 
FROM packages as t1 

INNER JOIN companies as t2 
ON t1.co_id=t2.id 

left JOIN tracking as t3 
ON t1.id = t3.pid and t3.action ='tookit' 

left JOIN tracking as t4 
ON t1.id = t4.pid and t4.action ='putit' 

我感謝所有幫助

Answer 1

重寫你的查詢檢查是否有幫助。

 

    SELECT 
     packages.id AS id, 
     packages.co_id AS co_id, 
     companies.name AS co_name, 
     companies.tel AS tel, 
     packages.datetime AS DATETIME, 
     t1.datetime AS tooktime, 
     t2.datetime AS puttime, 
     packages.status AS STATUS 
    FROM 
     packages 
     LEFT JOIN companies 
     ON packages.co_id = companies.id 
     LEFT JOIN tracking t1 
     ON packages.id = t1.pid 
     AND t1.ACTION = 'tookit' 
     LEFT JOIN tracking t2 
     ON packages.id = t2.pid 
     AND t2.ACTION = 'putit'