Question

我想计算con_Amount字段＆amp;想要在Con_PubDate的条件下将总数放到D01，D02，...... D31。如果Con_PubDate字段Day = 1那么我想将总数设为D01，如果Con_PubDate字段Day = 2那么我想将总数设为D02，同样直到Day = 31然后我想将总数设为D31

我尝试在存储过程中使用代码但是它有错误。有人请帮我解决这个问题。

SELECT Con_Cnt_Code,
       Con_Dst_Code,
       Con_Cor_Code,
       SUM(CASE
            WHEN DATEPART(DAY,Con_PubDate) = 1 THEN con_Amount
       ELSE
            SUM(CASE
                WHEN DATEPART(DAY,Con_PubDate) = 2 THEN con_Amount
            ELSE
                 SUM(CASE
                WHEN DATEPART(DAY,Con_PubDate) = 31 THEN con_Amount
                END) AS D31
            END) AS D02
        END) AS D01
 FROM Contributions 
 GROUP BY Con_Cnt_Code,Con_Dst_Code,Con_Cor_Code

Answer 1

您可能希望CASE表达式的每个条件总和作为选择列表中的单独项目，如下所示：

SELECT
    Con_Cnt_Code,
    Con_Dst_Code,
    Con_Cor_Code,
    SUM(CASE WHEN DATEPART(DAY,Con_PubDate) = 1  THEN con_Amount END) AS D01,
    SUM(CASE WHEN DATEPART(DAY,Con_PubDate) = 2  THEN con_Amount END) AS D02,
    -- and possibly other days as well
    SUM(CASE WHEN DATEPART(DAY,Con_PubDate) = 31 THEN con_Amount END) AS D31
FROM Contributions
GROUP BY
    Con_Cnt_Code, Con_Dst_Code, Con_Cor_Code;

默认情况下，SUM会忽略NULL个值，因此您的ELSE表达式中可能不需要CASE条件。如果你添加一个，你可以默认金额总和为零。

SQL中的条件SUM

1 个答案: