列表對於具有最長的運輸延遲

Question

列出該具有最長的運輸延遲

我嘗試以下，但不能顯示的順序發貨城市和國家的順序發貨城市和國家：

TRENTON   NJ    4 

作爲需要由查詢返回的唯一結果。

select shipcity, shipstate, shipdate-orderdate "Shipping Delay" 
from orders 
having max(shipdate-orderdate) >any (select shipdate-orderdate 
       from orders 
       where shipdate is not null) 
group by shipcity, shipstate, shipdate-orderdate; 

Answer 1

假設MySQL的：

select shipcity, shipstate, (shipdate - orderdate) AS "Shipping Delay" 
from orders 
order by "Shipping Delay" desc 
limit 1 

如果你真的堅持子查詢，但當然，上述工程：

select shipcity, shipstate, (shipdate - orderdate) AS Shipping_Delay 
from orders 
where shipdate-orderdate = (SELECT MAX(shipdate-orderdate) FROM orders)