Question

我有一张表spending，其中包含一些基本字段，用于定义购买项目，购买时间和购买价值，以及从中购买的帐户：{{1} }，spItem，spAmount和spDate。

我已经提出了一个查询，每月对它们进行分组，一次一个帐户，这样可以正常工作：

spAccount

和

SELECT YEAR(spDate) as spYear,
       MONTH(spDate) as spMonth,
       SUM(spAmount) AS TotalAmount
FROM spending
WHERE spAccount like 'Bank1'
GROUP BY YEAR(spDate), MONTH(spDate)
ORDER BY YEAR(spDate), MONTH(spDate)

我正在尝试获取一个可以合并两个查询的表，并将SELECT YEAR(spDate) as spYear, MONTH(spDate) as spMonth, SUM(spAmount) AS TotalAmount FROM spending WHERE spAccount like 'Bank2' GROUP BY YEAR(spDate), MONTH(spDate) ORDER BY YEAR(spDate), MONTH(spDate)显示在一列中，并Bank1显示在下一列中。可能有几个月其中一个账户没有支出。在这种情况下，它应显示零值，而不是跳过它。

任何能够以正确的方式指出我的人都将非常感激。

Answer 1

将年份和月份的日期选择组合为一个将相应排序和分组的字段。另外，请确保首先对帐户进行分组，因为SQL中的分组顺序很重要。

Answer 2

SELECT YEAR(spDate) as spYear, MONTH(spDate) as spMonth, SUM(spAmount) AS TotalAmount,(SELECT SUM(spAmount) AS TotalAmount2 FROM spending WHERE spAccount like 'Bank2' GROUP BY YEAR(spDate), MONTH(spDate) ORDER BY YEAR(spDate), MONTH(spDate)) FROM spending WHERE spAccount like 'Bank1' GROUP BY YEAR(spDate), MONTH(spDate) ORDER BY YEAR(spDate), MONTH(spDate)

Answer 3

我希望我能正确理解你的问题： - ）

对于每个可用的月份和年份（其中至少有一个帐户中存在数据）显示每个帐户的SUM（即使其中一个帐户为0）。为此，我加入了2个查询并使用ISNULL函数从正确的源获取数据。

这是我的虚拟数据解决方案：

--Preparing Dummy Data
;WITH spending
 AS (SELECT '01-01-2010' spDate, 
            100          spamount, 
            'Bank1'      spaccount 
     UNION 
     SELECT '01-01-2010' spDate, 
            200          spamount, 
            'Bank1'      spaccount 
     UNION 
     SELECT '03-01-2010' spDate, 
            150          spamount, 
            'Bank1'      spaccount 
     UNION 
     SELECT '04-01-2010' spDate, 
            500          spamount, 
            'Bank1'      spaccount 
     UNION 
     SELECT '01-01-2010' spDate, 
            200          spamount, 
            'Bank1'      spaccount 
     UNION 
     SELECT '03-01-2010' spDate, 
            10           spamount, 
            'Bank2'      spaccount 
     UNION 
     SELECT '05-01-2010' spDate, 
            800          spamount, 
            'Bank2'      spaccount 
     UNION 
     SELECT '03-01-2010' spDate, 
            110          spamount, 
            'Bank2'      spaccount 
     UNION 
     SELECT '01-01-2010' spDate, 
            100          spamount, 
            'Bank2'      spaccount) 
--End of Dummy Data

--Start Query on Dummy Data
SELECT ISNULL(Bank1.SPMONTH, Bank2.SPMONTH) AS spMonth, 
       ISNULL(Bank1.SPYEAR, Bank2.SPYEAR)   AS spYear, 
       ISNULL(Bank1.TOTALAMOUNT, 0)         AS TotalAmount_Bank1, 
       ISNULL(Bank2.TOTALAMOUNT, 0)         AS TotalAmount_Bank2 
FROM   (SELECT YEAR(SPDATE)  AS spYear, 
               MONTH(SPDATE) AS spMonth, 
               SUM(SPAMOUNT) AS TotalAmount 
        FROM   spending 
        WHERE  SPACCOUNT LIKE 'Bank1' 
        GROUP  BY YEAR(SPDATE), 
                  MONTH(SPDATE)) AS Bank1 
       FULL JOIN (SELECT YEAR(SPDATE)  AS spYear, 
                         MONTH(SPDATE) AS spMonth, 
                         SUM(SPAMOUNT) AS TotalAmount 
                  FROM   spending 
                  WHERE  SPACCOUNT LIKE 'Bank2' 
                  GROUP  BY YEAR(SPDATE), 
                            MONTH(SPDATE)) AS Bank2 
              ON Bank1.SPMONTH = Bank2.SPMONTH 
                 AND Bank2.SPYEAR = Bank2.SPYEAR 
ORDER  BY SPYEAR, 
          SPMONTH

Answer 4

您可以使用条件聚合分组在一个查询中获取两个帐户的总计。这就是它的样子：

SELECT YEAR(spDate) as spYear,
       MONTH(spDate) as spMonth,
       SUM(CASE spAccount WHEN 'Bank1' THEN spAmount ELSE 0 END) AS Bank1,
       SUM(CASE spAccount WHEN 'Bank2' THEN spAmount ELSE 0 END) AS Bank2
FROM spending
WHERE spAccount IN ('Bank1', 'Bank2')
GROUP BY YEAR(spDate), MONTH(spDate)
ORDER BY YEAR(spDate), MONTH(spDate)
;

group，sum和join结合在sql中

4 个答案: