SQL 가장 높은 값을 얻을 연결할

Question

나는 다음과 같은 데이터 테이블이있는 경우

ProductID,StockOnSite,StockOffsite 
    1   83   81  
    1   98   85  
    1   112   101  
    2   81   85  
    2   115   83  
    2   115   101  

내가 만들 StockOffsite로 최고 제품 ID 당 StockOnSite합니다 (StockDifference 계산) 레코드와 concatinate StockOnSite를 얻을 수있다 할 필요 열은 StockInfo

출력 필요

ProductID,StockOnSite,StockOffsite,StockDifference,StockInfo 
    1   98   85   13   98/85 
    2   115   83   32   115/83 

SQL 나는

,536,913,632와 함께 올라와있다 10

select ProductID 
     ,StockOnSite 
     ,StockOffsite 
     ,StockDifference = max(StockOnSite - StockOffsite) 
from Product 
group by ProductID, StockOnSite, StockOffsite 

여기에서 어디로 가야할 지 모르겠습니까?

감사

아래 테이블과 데이터를 구축하는 쿼리입니다 :

CREATE TABLE Products 
(
    ProductID int NOT NULL, 
    StockOnSite int NOT NULL, 
    StockOffsite int NOT NULL 
) 

insert into table Products(ProductID, StockOnSite, StockOffsite) values(1,83,81) 
insert into table Products(ProductID, StockOnSite, StockOffsite) values(1,98,85) 
insert into table Products(ProductID, StockOnSite, StockOffsite) values(1,112,101) 
insert into table Products(ProductID, StockOnSite, StockOffsite) values(2,81,85) 
insert into table Products(ProductID, StockOnSite, StockOffsite) values(2,115,83) 
insert into table Products(ProductID, StockOnSite, StockOffsite) values(2,115,101) 

Answer 1

select ProductID 
     ,StockOnSite 
     ,StockOffsite 
     ,StockOnSite - StockOffsite 
     ,cast(Stockonsite as varchar(10))+'/' +cast(StockOffsite as varchar(10)) 
from Products pr1 
where StockOnSite - StockOffsite = (Select max(StockOnSite - StockOffsite) 
             from Products pr2 
             where pr1.ProductID = pr2.ProductID 
             ) 
group by ProductID, StockOnSite, StockOffsite 

Answer 2

이 트릭을 할해야한다가. 또한 115있을 때,

select p.ProductID 
     ,p.StockOnSite 
     ,p.StockOffsite 
     ,(p.StockOnSite - p.StockOffsite) StockDifference 
     ,concat(p.StockOnSite,'/',p.StockOffsite) StockInfo 
from Products p 
where concat(ProductID,'-',(StockOnSite - StockOffsite)) = 
     (
     select concat(ProductID,'-',max((StockOnSite - StockOffsite))) 
     from Products p2 
     where p2.ProductID = p.ProductID 
     group by ProductID 
     ) 
;