countif 和 sumif 每行而不分组

Question

我正在尝试使用 SQL

计算 sumif 和 countif

这是开始的代码： SELECT
商品编号，供应商，成本，销售价格从 countifExpirement

我正在尝试创建此输出：

前四列已经有数据，我正在尝试创建计算字段来计算重复项目、每个供应商的项目和供应商的成本。在 excel 中轻松创建。有很多使用分组方法的示例，但我需要每一行都存在。

Answer 1

在标准 SQL 中，您将为此使用解析函数。然而，它们并非在每个 DBMS 中都可用。

select 
  itemid, supplier, cost, saleprice, 
  count(*) over (partition by itemid) as count_itemid, 
  count(*) over (partition by supplier) as count_supplier, 
  sum(cost) over (partition by supplier) as cost_suppler
from countifexpirement;

这里与sub-select相同，每个DBMS都可用：

select 
  itemid, supplier, cost, saleprice, 
  (
    select count(*) 
    from countifexpirement x 
    where x.itemid = countifexpirement.itemid
  ) as count_itemid, 
  (
    select count(*) 
    from countifexpirement x 
    where x.supplier = countifexpirement.supplier
  ) as count_supplier, 
  (
    select sum(cost)
    from countifexpirement x 
    where x.supplier = countifexpirement.supplier
  ) as cost_suppler
from countifexpirement;

countif 和 sumif 每行而不分组

countif and sumif each row without grouping

sql

sum

countif