Question

我在SQL Server中编写存储过程，执行以下操作：

获取前5名导入者
计算每个
根据总进口总值和总量计算百分比

这是我的疑问：

    DECLARE @OVERALL_TOTAL_VAL AS BIGINT
    DECLARE @OVERALL_TOTAL_VOL AS BIGINT

    SET NOCOUNT ON;

    -- GET TOTAL VALUE AND VOLUME FROM ALL IMPORTERS TO USE FOR GETTING THE %
    SET @OVERALL_TOTAL_VAL = (SELECT SUM(IMPORTEDVALUE) 
                                FROM [DBO].[ALERT]
                                WHERE IMPORTERCODE != 0)
    SET @OVERALL_TOTAL_VOL = (SELECT SUM(IMPORTEDVOLUME)
                                FROM [DBO].[Alert]
                                WHERE IMPORTERCODE != 0)

    -- GET TOP 5 IMPORTERS
    SELECT 
        TOP 5 IMPORTERCODE,
        @OVERALL_TOTAL_VAL TOTAL_VAL,
        @OVERALL_TOTAL_VOL TOTAL_VOL,
        SUM(IMPORTEDVALUE) TOTAL_IMPORT_VALUE, 
        SUM(IMPORTEDVOLUME) TOTAL_IMPORT_VOL, 
        --((SUM(IMPORTEDVALUE) / @OVERALL_TOTAL_VAL) * 100) NET_VAL,
        --((SUM(IMPORTEDVOLUME) / @OVERALL_TOTAL_VOL) * 100) NET_VOL,
        --(((SELECT SUM(IMPORTEDVALUE) 
        -- FROM [DBO].[ALERT]
        -- WHERE IMPORTERCODE = A1.IMPORTERCODE
        -- GROUP BY IMPORTERCODE) / @OVERALL_TOTAL_VAL) * 100 ) NET_VAL,
        COUNT(*) ALERT_COUNT
    FROM [DBO].[ALERT] A1

    WHERE IMPORTERCODE != 0
    GROUP BY IMPORTERCODE
    ORDER BY ALERT_COUNT DESC;

评论出来的是我尝试过的，但不幸的是没有用。我也尝试过交叉加入（通过Get column sum and use to calculate percent of total (mySQL)）;也不行。

这是因为我的TOP 5声明中有SELECT吗？我试图做的是什么？因为如果没有，我必须在我的应用程序的前端进行百分比计算，如果可能的话我想避免这种情况。

请帮忙。谢谢。

更新：最后让它发挥作用。猜猜毕竟不需要参数。谢谢lad2025的帮助！

SELECT DISTINCT
    TOP 5 IMPORTERCODE,
    SUM(IMPORTEDVALUE) OVER(PARTITION BY IMPORTERCODE) AS TOTAL_IMPORT_VAL,
    SUM(IMPORTEDVOLUME) OVER(PARTITION BY IMPORTERCODE) AS TOTAL_IMPORT_VOL,
    100.0 * SUM(IMPORTEDVALUE) OVER (PARTITION BY IMPORTERCODE)/
            SUM(IMPORTEDVALUE) OVER() AS NET_VAL,
    100.0 * SUM(IMPORTEDVOLUME) OVER (PARTITION BY IMPORTERCODE)/
            SUM(IMPORTEDVOLUME) OVER() AS NET_VOL,
    COUNT(*) OVER(PARTITION BY IMPORTERCODE) ALERT_COUNT
FROM [DBO].[ALERT]
WHERE IMPORTERCODE != 0
ORDER BY ALERT_COUNT DESC;

Answer 1

您可以使用windowed functions：

SELECT DISTINCT TOP 5 IMPORTERCODE,
   SUM(IMPORTEDVALUE) OVER(PARTIITON BY IMPORTERCODE) AS total_import_value
   SUM(IMPORTEDVOLUME) OVER(PARTIITON BY IMPORTERCODE) AS total_import_volumne,
   100.0 * SUM(IMPORTEDVALUE) OVER(PARTIITON BY IMPORTERCODE)/
           SUM(IMPORTEDVALUE) OVER() AS [% value percentage],
   100.0 * SUM(IMPORTEDVOLUME) OVER(PARTIITON BY IMPORTERCODE)/
           SUM(IMPORTEDVOLUME) AS [% volume percentage]
FROM [DBO].[ALERT]
WHERE IMPORTERCODE != 0
ORDER BY total_import_value DESC

计算使用TOP子句的两列之间的百分比

1 个答案: