SQL按筛选器对组外的项进行计数

假设我有下表：

Product A    Product B
Water        Soda
Water        Soda
Water        Eggs
Water        Apples

我试图计算产品组合和每个产品的数量，因此我的结果是：

Product A   Product B   Combination Product A Count Product B Count
Water        Soda               2                 4               2
Water        Eggs               1                 4               1
Water        Apples             1                 4               1

不幸的是，一旦我将产品分组，我就无法获得单个计数。任何帮助都将不胜感激

SELECT [ProductA], [ProductB], Count(*) as ComboCount
FROM [ProductCombinations]
GROUP BY [ProductA], [ProductB]
Order by ComboCount Desc

---

您可以独立计算每个产品的数量，并将其加入当前查询：

SELECT   p.[ProductA], p.[ProductB], COUNT(*) As CombotCount, 
         ProductA_Count, ProductB_Count
FROM     [ProductCombinations] p
JOIN     (SELECT   [ProductA], COUNT(*) AS ProductA_Count
          FROM     [ProductCombinations]
          GROUP BY [ProductA]) a ON p.[ProductA] = a.[ProductA]
JOIN     (SELECT   [ProductB], COUNT(*) AS ProductB_Count
          FROM     [ProductCombinations]
          GROUP BY [ProductB]) a ON p.[ProductA] = b.[ProductB]
GROUP BY [ProductA], [ProductB]
ORDER BY ComboCount DESC

子查询可以做到这一点。 （i代表“内部”，o代表“外部”）

---

这很好用，很干净，我认为：

SELECT DISTINCT [Product A], [Product B], 
    COUNT(*) OVER (PARTITION BY [Product A], [Product B]) ComboCount, 
    COUNT(*) OVER (PARTITION BY [Product A]) [Product A Count], 
    COUNT(*) OVER (PARTITION BY [Product B]) [Product B Count]
FROM [ProductCombinations]
ORDER BY ComboCount DESC

SELECT DISTINCT [Product A], [Product B], 
    COUNT(*) OVER (PARTITION BY [Product A], [Product B]) ComboCount, 
    COUNT(*) OVER (PARTITION BY [Product A]) [Product A Count], 
    COUNT(*) OVER (PARTITION BY [Product B]) [Product B Count]
FROM [ProductCombinations]
ORDER BY ComboCount DESC