MySQL的加入，從一個表和第一行中的所有行從另一個表

Question

我有兩個表的屬性和property_images

where properties.pid = property_images.pid 

屬性可以有一個以上的圖像，我有選擇的所有屬性和第一屬性圖像

Answer 1

select 
    t1.* , 
    t2.image 
from properties as t1 
left join (
      select 
       min(id), 
       pid, 
       image 
      from property_images 
      group by pid) as t2 
on t2.pid = t1.pid 

Answer 2

select * from property a 
left join (select * from property_Images b group by pid) s on s.pid=a.pid ; 

Answer 3

select 
    pro.* 
from properties as pro 
left join (
      select 
       min(id), 
       pid, 
       image 
      from property_images 
      group by pid) as pro_img 
on pro.pid = pro_img.pid 

Answer 4

select * 
from properties as t1 
left join property_images t2 on (t1.pid=t2.pid) 
where t2.id in 
      (select min(id) from property_images where property_images.pid=t2.pid) 

OR假設有在property_images一個唯一的密鑰ID：

select * 
from properties as t1 
left join (select min(id) minID, pid from property_images group by pid) t2 
    on (t1.pid=t2.pid) 
left join property_images t3 on (t2.minID=t3.id) 

選擇哪一個是你的數據庫更快。