asp.net - 从 SQL 中的单个表中获取相同属性的两个不同值

Question

我有三张桌子，即。Bids(bid_id,base_price),Customer(customer_id,name,..) 和 Customer_Bid(customer_id,bid_id,bidding_amount) 其中客户出价和他的出价金额存储在 Customer_Bid 表中。我想显示客户的详细信息以及他的出价 id 以及对同一出价 id 出价最高的人。

我试图获取客户详细信息，但我无法显示他的出价金额以及位于同一张表中的最高出价金额。

请任何人都可以帮助我。谢谢。

编辑 这是评论中的查询

select cb.bid_id, c.customer_id ,MyBid=cb.total_bidding_ammount
, HighestBid= max(cb.total_bidding_ammount) 
from customer as c
,customer_bidding as cb
,bid as b 
group by cb.bid_id, c.customer_id, cb.total_bidding_ammount 

Answer 1

如果你改变这个：

, HighestBid= max(cb.total_bidding_ammount)

像这样：

, HighestBid = 
(select max(bidding_ammount)
from customer_bidding
where bid_id = bid.bid_id)

你会走在正确的轨道上。

Answer 2

select a.*, b.bidding_amount,
     e.bidding_amount as highest_bid
from customer a
inner join customer_bid b on a.customer_id = b.customer_id
inner join bids c on b.bid_id = c.bid_id
join 
    (select * from (
    select bidding_amount,bid_id
    from customer_bid
    order by bidding_amount desc
    ) d group by d.bid_id) e on b.bid_id = e.bid_id 

Answer 3

试试这个：

SELECT  cb.bid_id, 
        c.customer_id,
        cb.total_bidding_ammount,
        topbids.customer_id as topbid_customer_id,
        topbid
FROM customer c
INNER JOIN customer_bidding as cb
ON c.customer_id = cb.customer_id
INNER JOIN (
            SELECT cb.bid_id, c.customer_id, MAX(cb.total_bidding_ammount) as topbid
            FROM customer c
            INNER JOIN customer_bidding cb
            ON (c.customer_id = cb.customer_id)
            GROUP BY cb.bid_id
           ) topbids
ON cb.bid_id = topbids.bid_id