Question

我在我的选择声明中也需要卖家ID，以便他们拥有最低价格和最高价格。以下是查询;请告诉我们需要做哪些更改？

Select count(Id) TotalSeller,
       min(price) as MinPrice, ***SellerID_for_min_price***,
       max(price) as MaxPrice, ***SellerID_for_max_price***
  from ProdPrice
 where prodPriceId=1212

数据：

ProdId  SellerID    Price
1212    65  34740
1212    20  34855
1212    88  37299
1212    69  38490
1212    108 39990
1212    35  39999
1212    96  40990

Answer 1

要执行此类查询，您希望使用row_number()来标识具有最小值和最大值的行：

Select count(Id) TotalSeller, min(price) as MinPrice,
       min(case when seqnum_min = 1 then id end) as SellerIdMin,
       max(price),
       min(case when seqnum_max = 1 then id end) as SellerIdMax
from (select pp.*,
             row_number() over (partition by prodPriceId order by price) as seqnum_min,
             row_number() over (partition by prodPriceId order by price desc) as seqnum_max
      from ProdPrice pp
      where prodPriceId=1212
     ) pp

要获取名称，可以在子查询中进行连接：

Select count(Id) TotalSeller, min(price) as MinPrice,
       min(case when seqnum_min = 1 then SellerName end) as SellerNameMin,
       max(price),
       min(case when seqnum_max = 1 then SellerName end) as SellerNameMax
from (select pp.*, s.SellerName,
             row_number() over (partition by prodPriceId order by price) as seqnum_min,
             row_number() over (partition by prodPriceId order by price desc) as seqnum_max
      from ProdPrice pp join
           Sellers s
           on pp.id = s.id
      where prodPriceId=1212
     ) pp

在SQL中不使用group by语句检索列值

1 个答案: