Question

我在这里并不是最精通SQL的人，但是我正在尝试联接两个表（一个包含费用数据，另一个包含预算数据）。我似乎无法找出正确的代码来按字段汇总支出，然后将其与那些特定字段的预算金额相加。

以下是我正在处理的数据的示例：

Expenses Table
BudgetAccount    Department    Entity   Date       Amount
Other Expenses   Finance       A        9/1/2019   100
Other Expenses   Finance       A        9/1/2019   300
Other Expenses   Finance       A        9/1/2019   50
Utilities        Finance       A        9/1/2019   200
Utilities        Construction  B        9/1/2019   300
Insurance        Construction  B        9/1/2019   400
Legal            HR            A        9/1/2019   500
Other Expenses   HR            A        9/1/2019   100
Legal            HR            A        9/1/2019   50

Budget Table
BudgetAccount    Department    Entity   Date       Amount
Other Expenses   Finance       A        9/1/2019   500
Utilities        Finance       A        9/1/2019   200
Insurance        Construction  B        9/1/2019   450
Utilities        Construction  B        9/1/2019   400
Legal            HR            A        9/1/2019   800
Other Expenses   HR            A        9/1/2019   50

这是我想要得到的最终产品：

BudgetAccount    Department    Entity   Date       Actual   Budget
Other Expenses   Finance       A        9/1/2019   450      500
Utilities        Finance       A        9/1/2019   200      200
Insurance        Construction  B        9/1/2019   400      450
Utilities        Construction  B        9/1/2019   300      400
Legal            HR            A        9/1/2019   550      800
Other Expenses   HR            A        9/1/2019   100      50

我尝试了以下代码：

SELECT e.budgetaccount, e.department, e.entity, e.date, SUM(e.amount) AS Actual, b.amount
FROM expenses AS e
  INNER JOIN (SELECT b.budgetaccount, b.department, b.entity, b.date, b.amount FROM budget AS b)
  ON e.budgetaccount = b.budgetaccount
  AND e.department = b.department
  AND e.entity = b.entity
  AND e.date = b.date
GROUP BY e.budgetaccount, e.department, e.entity, e.date

。。。这是我尝试在Tableau中运行查询时遇到的错误：

Error Message

我敢肯定，我在上面尝试做得很差的编码中有很多错误，但是对我指出正确方向的任何帮助将不胜感激。

Answer 1

我想您可能会遇到的唯一错误是not a group by etc.，因为没有行与预算金额行不匹配，因此应在预算金额上添加一个最大值。实际上，内部联接会将第二个表记录作为输出，但事实是，列数和预算额列中没有记录是不同的，因此数据将是冗余的还是更多，具体取决于哪个表列具有更多的记录，因此所有第一个表记录是内部联接的实际o / p，在其上放一个group by将通过合计聚合减少实际数量的行，但是将表预算金额列的记录保持为没有聚合等的更多。尽管表预算帐户只有1个第一个表中每个唯一行的预算金额，但这并不意味着在最坏的情况下不能有多个，因此group by期望budgetamount列上的汇总也可以保持数据一致

   Select... max(b.amount)..
   Rest the same query

Answer 2

发现了两个问题

1）表名别名b的位置错误

2）您需要的列不在聚合函数中

SELECT e.budgetaccount, e.department, e.entity, e.date, SUM(e.amount) AS Actual, b.amount
FROM expenses AS e
LEFT JOIN (
  SELECT budgetaccount
  , department
  , entity
  , date
  , amount 
  FROM budget
)  b ON e.budgetaccount = b.budgetaccount
      AND e.department = b.department
        AND e.entity = b.entity
        AND e.date = b.date
GROUP BY e.budgetaccount, e.department, e.entity, e.date, b.amount

无论如何，您可以避免对预算表进行子查询。

SELECT e.budgetaccount, e.department, e.entity, e.date, SUM(e.amount) AS Actual, b.amount
FROM expenses AS e
LEFT JOIN budget b ON e.budgetaccount = b.budgetaccount
      AND e.department = b.department
        AND e.entity = b.entity
        AND e.date = b.date
GROUP BY e.budgetaccount, e.department, e.entity, e.date, b.amount

Answer 3

我相信您已经关闭查询。似乎不需要子选择，也不需要添加其他SUM

    SELECT e.budgetaccount, e.department, e.entity, e.date, SUM(e.amount) AS Actual, SUM(b.amount) as budget
    FROM expenses AS e
    JOIN budget AS b
      ON e.budgetaccount = b.budgetaccount
      AND e.department = b.department
      AND e.entity = b.entity
      AND e.date = b.date
    GROUP BY e.budgetaccount, e.department, e.entity, e.date

一个表中的金额总和，而另一表中的总金额

3 个答案: