從SQL中的單個表獲取相同屬性的兩個不同值

Question

我有三張桌子，也就是。 投標（bid_id，base_price），Customer（customer_id，name ..）和Customer_Bid（customer_id，bid_id，bidding_amount），其中客戶出價及其出價金額存儲在Customer_Bid表中。 我想顯示客戶的詳細信息以及他的出價ID，以及出價最高的客戶。

我試圖獲取客戶詳細信息，但我無法在同一張表中顯示他的出價金額以及最高出價金額。

請任何人可以幫助我。 謝謝。

編輯這是注釋中的查詢

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

如果您更改此設置：

, HighestBid= max(cb.total_bidding_ammount)

像這樣：

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

你會在正確的軌道。

Answer 2

試試這個：

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

Answer 3

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