如何从 sql 中的表中获取最小值

Question

我从表中得到最高值和最低值，表也接受空值。我能够得到最高值但不是最低值。

这是我的表格数据：

PostBidId UserId   PostId        BidAmount
-------------------------------------------------
1691       159       1239   
1684       147       1239        100000000000000
1683       147       1239        12345666666
1680       147       1239        6777777
1682       147       1239        900
1681       147       1239        90000000

我的最高价值是100000000000000 ，低价值 id 900 。

这是我的代码：

SELECT TOP(1) 
    BidAmount AS HighestBid, '0' AS LowestBid 
FROM 
    [dbo].[Bids] 
WHERE
    PostId = 1239 AND BidAmount != '' 
ORDER BY
    BidAmount ASC

Output 是：100000000000000

SELECT
    MIN (BidAmount) AS LowestBid, '0' AS HighestBid 
FROM 
    [dbo].[Bids] 
WHERE
    PostId = 1239 AND BidAmount != '' 

Output 是： 100000000000000 ，我期待的是： 900 。

Answer 1

    SELECT MIN (CAST (BidAmount as bigint)) AS LowestBid, '0' AS HighestBid
    FROM [dbo].[Bids] 
    WHERE PostId = 1239 AND BidAmount != ''