PowerQuery PowerBI 根据 StartDate 和 EndDate 之间的条件合并 2 个表

Question

我尝试使用 Power Query/PowerBI: Absence 和 dimDate 加入 2 tables 来创建下面的结果 table：

缺席 table

+------------+--------------+--------------+-----------+-----------+
| EmployeeId | EmployeeName | AbsenceType  | StartDate |  EndDate  |
+------------+--------------+--------------+-----------+-----------+
|          1 | A            | Annual Leave | 2/01/2017 | 5/01/2017 |
|          2 | B            | Sick Leave   | 4/01/2017 | 6/01/2017 |
+------------+--------------+--------------+-----------+-----------+

dimDate table

+------------+
|  FullDate  |
+------------+
| 1/01/2017  |
| 2/01/2017  |
| 3/01/2017  |
| 4/01/2017  |
| 5/01/2017  |
| 6/01/2017  |
| 7/01/2017  |
| 8/01/2017  |
| 9/01/2017  |
| 10/01/2017 |
+------------+

结果

+------------+--------------+--------------+-----------+
| EmployeeId | EmployeeName | AbsenceType  |   Date    |
+------------+--------------+--------------+-----------+
|          1 | A            | Annual Leave | 2/01/2017 |
|          1 | A            | Annual Leave | 3/01/2017 |
|          1 | A            | Annual Leave | 4/01/2017 |
|          1 | A            | Annual Leave | 5/01/2017 |
|          2 | B            | Sick Leave   | 4/01/2017 |
|          2 | B            | Sick Leave   | 5/01/2017 |
|          2 | B            | Sick Leave   | 6/01/2017 |
+------------+--------------+--------------+-----------+

我通常使用 SQL 来创建这个结果，但是我不知道如何在 PowerQuery 中高效地完成它。

SELECT A.EmployeeId
        ,A.EmployeeName
        ,A.AbsenceType
        ,D.FullDate
FROM Absence AS A
INNER JOIN dimDate AS D ON (
                D.FullDate >= A.StartDate
                AND D.FullDate <= A.EndDate
                )

注意：我试过Full Join between 2 tables Absence and dimDate，如果dimDate.FullDate >= StartDate 和dimDate.FullDate <= 结束日期。然而，这种方法似乎对大型 table 无效，并且它会在过滤之前创建冗余记录，因此速度非常慢。

请多多指教

Answer 1

不需要合并。您可以创建一个列，其中包含 StartDate 和 EndDate 之间所有日期的嵌入列表。然后展开该列。

let
    Source = Table1,
    #"Added Custom" = Table.AddColumn(Source, "Date", each List.Dates([StartDate],1+Duration.Days([EndDate]-[StartDate]),#duration(1,0,0,0))),
    #"Expanded Date" = Table.ExpandListColumn(#"Added Custom", "Date"),
    #"Changed Type" = Table.TransformColumnTypes(#"Expanded Date",{{"Date", type date}}),
    #"Removed Columns" = Table.RemoveColumns(#"Changed Type",{"StartDate", "EndDate"})
in
   #"Removed Columns"

PowerQuery PowerBI 根据 StartDate 和 EndDate 之间的条件合并 2 个表

PowerQuery PowerBI merge 2 tables based on condition between StartDate and EndDate

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