如何在mysql中的2個表中顯示最近更新的記錄

Question

我已經創建了2個表（businesstbl，businessupdatestbl）。現在，我想顯示每個業務添加的最後記錄。該表應該是這樣的：

businesstbl

 
bus_id bus_name  
    1   bus1  
    2   bus2 

businessupdatestbl

 
    bus_up_id bus_up_description bus_id(FK) bus_up_date 
    1   description1  1    2013-12-02 
    2   description2  1    2013-01-02 
    3   description3  2    2013-01-29 
    4   description4  2    2013-02-01 
    5   description4  2    2013-01-01 

結果應該是：

 
    bus_id bus_name bus_up_description 
    1  bus1  description1  
    2  bus2  description4 

Answer 1

select b.*, bu.* 
from businesstbl b 
join businessupdatestbl bu on b.bus_id = bu.bus_id 
join 
(
    select bus_id, max(bus_up_date) as max_bus_up_date 
    from businessupdatestbl 
    group by bus_id 
) bumax on on bu.bus_id = bumax.bus_id and bu.bus_up_date = bumax.max_bus_up_date