組合兩個複雜的SQL查詢

Question

所以我來到我的SQL實力的絕對限制，我不能爲我的生活結合這兩個查詢，首先這裏是我的數據庫看起來像

電流 - 表

ID - Unique identifier for device (Int) 
Location -Unique identifier for name of area (VarChar) 
Status - The current status of the device (VarChar) 
Time - DateTime of when the last connection was made to the device (DateTime) 

歷史

CID (Sorta unused, just as an AI field to store multiple old bits of data uniquely) (Int) 
ID - Unique identifier for device (Int) 
Location --Unique identifier for name of area (VarChar) 
Status - The current status of the device (VarChar) 
Time -- DateTime of when the last connection was made to the device (DateTime) 

因此，與在座各位說的這兩個查詢：

查詢1：

SELECT *, if(HOUR(TIMEDIFF(NOW(), TIME)) >=1, 1, 0) as OlderThanAnHour 
FROM Current 
WHERE Location like "MyLocation" 

查詢2：

SELECT ID, min(time), (abs(timestampdiff(HOUR,NOW(),TIME))/count(*)*100) as percentage 
from Historical 
where LOCATION like "MyLocation" 
group by ID 

我的目標是將它們組合成一個單一的查詢，因爲這將是通常被稱爲

Answer 1

嘗試：

SELECT c.*, 
     if(HOUR(TIMEDIFF(NOW(), c.TIME)) >=1, 1, 0) as LatestOlderThanAnHour, 
     min(h.time) as EarliestTime, 
     (abs(timestampdiff(HOUR,NOW(),min(TIME)))/count(*)*100) as percentage 
FROM Current c 
JOIN Historical h on c.ID = h.ID 
WHERE c.Location like "MyLocation" 
group by c.ID