Question

我有一台台式机。数据如下所示

Item         Sub_Item       qty

XYZ          ABC            100
XYZ          ABC            80
XYZ          PQR            120
DEF          KKK            100
DEF          KKK             50
DEF          LLL            120
DEF          LLL             70
QQQ          DDD            200
PQR          OOO            100
PQR          OOO             60

情节是，我只需要那些记录， Item中有两个或多个不同的sub_items，和查询应返回sub_item的总和（qty）的最小值如果按项目＆amp;组分组，它应该更新。 sub_item只返回一行。

上表的查询结果如下：

Item         Sub_Item       qty

XYZ          PQR            120
DEF          KKK            150

它应该更新其他记录，因为它们不符合标准。请帮我查询。

Answer 1

select
  y.Item,
  y.SubItem,
  y.GroupQty
from  
    ( -- Rank the items by quantity and exclude the items that only have 1 subitem.
    select
      x.Item,
      x.SubItem,
      x.GroupQty,
      dense_rank() over (partition by x.Item order by x.GroupQty) as GroupRank
    from
        ( -- Group by item and subitem. Sum quantity and count the number of subitems per item.
        select
          t.Item,
          t.Sub_Item,
          sum(t.qty) as GroupQty,
          count(distinct t.sub_item) over (partition by t.Item) as SubItemCount
        from
          YourTable t 
        group by 
          t.item,
          t.sub_item ) x
    where
      x.SubItemCount > 1) y
where
  y.GroupRank = 1 -- Return only the subitems with the lowest sum.

SQL查询使用具有棘手逻辑的函数组

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