sql - SQL产品/产品销售

Question

一种常见的（我假设？）查询类型：

我有两个表（'products'、'productsales'）。“productsales”中的每条记录都代表一次销售（因此它有“date”、“quantity”、“product_id”）。我如何有效地进行如下查询：

检索在日期 Y 和日期 Z 之间销售超过 X 次的所有产品的产品名称。

（X 是销售数量而不是交易数量）

Answer 1

 SELECT p.[name]
 FROM products p
 WHERE p.product_id in (SELECT s.product_id
     FROM productsales s
     WHERE s.[date] between @dateStart and @dateEnd
     GROUP BY s.product_id
     HAVING Sum(s.quantity) > @X )

Answer 2

上面的查询并不完全正确......

SELECT Name FROM Products
WHERE ProductId IN
( SELECT ProductId 
  FROM ProductSales
  WHERE ProductSales.Date BETWEEN  Y AND Z 
  GROUP BY ProductId
  HAVING SUM(ProductSales.Qty) > x
)

Answer 3

实际上，我认为您应该通过语句来学习分组

最简单的说法是：

SELECT ps.product_id, COUNT(*) 
           FROM product_sales ps 
           WHERE ps.product_id = id AND ps.Date BETWEEN @Y AND @Z
           GROUP_BY product_id;

Answer 4

SELECT p.[name]
FROM
products p
INNER JOIN
productsales ps
ON 
p.id = ps.product_id
WHERE
ps.date BETWEEN @Y AND @Z
GROUP BY
p.[name] 
--,p.id if it is likely that you have two products with the same name
HAVING
SUM(ps.quantity) > @X

使用MS AdventureWorks DB成功测试，使用以下 -

DECLARE @Y DATETIME, @Z DATETIME, @X INT    

SET @Y = '2004-06-09'
SET @Z = '2004-08-01'
SET @X = 100

    SELECT p.[Name]
    FROM
    Production.Product p
    INNER JOIN
    Sales.SalesOrderDetail ps
    ON 
    p.ProductID = ps.ProductID
    WHERE
    ps.ModifiedDate BETWEEN @Y AND @Z
    GROUP BY p.Name
    HAVING
    SUM(ps.OrderQty) > @X