如何在 do 列中按日期划分分组数据

Question

我有一个数据集，我想按客户代码分组，对于每个代码，我想对一个月的日期之间的交易总计求和，并让每个月成为一个单独的列。我可以使这个动态我主要关心的是构造初始 select 以根据需要输出数据。

我有：

SELECT [cmasterno]
    ,CASE 
        WHEN Month([dtrs]) = 1
            AND Year([dtrs]) = YEAR(GETDATE())
            THEN SUM([nftrsamt])
        END AS 'Jan 2014'
    ,CASE 
        WHEN Month([dtrs]) = 2
            AND Year([dtrs]) = YEAR(GETDATE())
            THEN SUM([nftrsamt])
        END AS 'Feb 2014'
FROM [AccountMate].[dbo].[gltrsn]
WHERE csource LIKE 'AR'
    AND cacctid LIKE '%4220%'
GROUP BY cmasterno

数据样本为

cmasterno   dtrs    ntrsamt
CEN01-A    1/24/2014    -22.2
AUT129-A    2/24/2014   -0.84
CEN01-A    1/22/2014    -19.86
CEN01-A    2/22/2014    -13.2
AUT129-A    1/22/2014   -18.42
AUT129-A    1/22/2014   -1
AUT129-A    2/22/2014   -316.56
CEN01-A    2/21/2014    -2.04

Answer 1

使用条件SUM

SELECT [cmasterno],
       SUM (CASE 
               WHEN Month([dtrs]) = 1 AND Year([dtrs]) = YEAR(GETDATE())
                    THEN [nftrsamt]
               ELSE 0
            END
           ) AS 'Jan 2014',
       SUM (CASE 
               WHEN Month([dtrs]) = 2 AND Year([dtrs]) = YEAR(GETDATE())
                    THEN [nftrsamt]
               ELSE 0
            END
           ) AS 'Feb 2014'
FROM [AccountMate].[dbo].[gltrsn]
WHERE csource LIKE 'AR'
    AND cacctid LIKE '%4220%'
GROUP BY cmasterno

Answer 2

为了完整起见，您也可以使用联接来完成此操作

SELECT [cmasterno], sum(jan.nftrsamt) as 'Jan 2014', sum(feb.nftrsamt) as 'Feb 2014'
FROM [AccountMate].[dbo].[gltrsn] b
LEFT JOIN [AccountMate].[dbo].[gltrsn] jan on b.cacctid = jan.cacctid and Month(jan.[dtrs]) = 1 AND Year(jan.[dtrs]) = YEAR(GETDATE())
LEFT JOIN [AccountMate].[dbo].[gltrsn] feb on b.cacctid = feb.cacctid and Month(feb.[dtrs]) = 2 AND Year(feb.[dtrs]) = YEAR(GETDATE())
WHERE csource LIKE 'AR' AND cacctid LIKE '%4220%'
GROUP BY cmasterno

根据您的索引，连接可能比案例快得多。那是 O(1) 而不是 O(N)

如何在 do 列中按日期划分分组数据

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