Question

当主键由两列而不是一列组成时，我怎么能这样做呢？

所以产品有两列作为PK，而productsales有两列作为FK。

这是一个带有1列密钥的解决方案：

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 1

这些方面的某些方法可以起作用

SELECT p.[name]
FROM products p
JOIN (SELECT s.key1, s.key2
    FROM productsales s
    WHERE s.[date] between @dateStart and @dateEnd
    GROUP BY s.product_id
    HAVING Sum(s.quantity) > @X ) as a on a.key1 = p.key1 and a.key2 = p.key2

Answer 2

也许这样的事情可以做到：

SELECT p.first_col_id,p.second_col_id 
FROM products p
JOIN productsales s
   ON s.first_col_id = p.first_col_id 
  AND s.second_col_id = p.second_col_id 
  AND s.[date] between @dateStart and @dateEnd
GROUP BY p.first_col_id,p.second_col_id 
HAVING Sum(s.quantity) > @X )

Answer 3

看起来上面有几个答案可行，但只是为了给你另一个解决方案，以防你的情况更好：

SELECT
     P.name
FROM
     Products P
WHERE
     EXISTS
     (
          SELECT
               *
          FROM
               ProductSales PS
          WHERE
               PS.product_id = P.product_id AND
               PS.date BETWEEN @date_start AND @date_end
          GROUP BY
               PS.product_id
          HAVING
               SUM(PS.quantity) > @cutoff_quantity
     )

使用Brownstone先生给出的GROUP BY方法，这种方法的表现往往比INNER JOIN差，但在某些情况下，取决于你的@cutoff_quantity值和表格大小，它可以表现得更好。

Answer 4

尝试：

SELECT p.[name]
FROM products p
WHERE (p.product_key1, p.product_key2) in
   (SELECT s.product_key1, s.product_key2
    FROM productsales s
    WHERE s.[date] between @dateStart and @dateEnd
    GROUP BY s.product_key1, s.product_key2
    HAVING Sum(s.quantity) > @X )

Answer 5

我喜欢这样做：

;WITH t 
     AS (SELECT s.product_id 
         FROM   productsales s 
         WHERE  s.[date] BETWEEN @dateStart AND @dateEnd 
         GROUP  BY s.product_id 
         HAVING Sum(s.quantity) > @X) 
SELECT p.[name] 
FROM   products p 
       JOIN t 
         ON p.pk1 = t.fk1 
            AND p.pk2 = t.fk2

Answer 6

用一个键重构

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

两个键相同：

SELECT s.k1, s.k2, p.[name]
FROM products p JOIN productsales s ON (p.k1=s.k1 AND p.k2=s. k2)
WHERE s.[date] between @dateStart and @dateEnd
GROUP BY s.k1, s.k2, p.[name]
HAVING Sum(s.quantity) > @X )

SQL组合键查询

6 个答案: