Question

我有一个查询，按月给出总销售额。但是，有几个月没有销售。如何在查询结果中获得该月份的0值？

SELECT
    p.Part,
    SUM(s.Sales) AS Sales,
    MONTH(s.SalesDate) AS Month_Sold
FROM
    Parts p
    LEFT OUTER JOIN Sales s ON p.Part = s.Part
GROUP BY
    p.Part,
    MONTH(s.SalesDate)
ORDER BY
    p.Part,
    Month_Sold

Answer 1

执行SUM(ISNULL(s.Sales, 0))以便聚合不会消除您的NULL值。虽然，由于您的销售数据也依赖于您的月份，因此您需要查看月份，以便即使您的销售数据中没有这些月份，也可以查看所有月份。

所以，像这样：

    ;WITH months AS
    (
        SELECT 1 AS mo
        UNION ALL
        SELECT mo +1
        FROM months
        WHERE mo < 12
    )

    SELECT p.Part, SUM(s.Sales) AS Sales, mo AS Month_Sold 
    FROM Parts p 
    CROSS APPLY months
    LEFT OUTER JOIN Sales s 
        ON p.Part = s.Part 
        AND months.mo = MONTH(s.SalesDate) 
    GROUP BY p.Part, months.mo ORDER BY p.Part, Month_Sold

如何获取缺少的摘要数据

1 个答案: