power query merge two tables based on the transaction date between two dates

问题

I'm trying to perform a join between two tables (1 - transaction table and 2 - employee ID and date range) using Power Query where the transaction date is between two dates.

Transaction Table

+-------+-----------------+--------+
| EmpID | TransactionDate | Amount |
+-------+-----------------+--------+
|   123 | 5/5/2019        |     30 |
|   345 | 2/23/2019       |     40 |
|   456 | 4/3/2018        |     50 |
+-------+-----------------+--------+

Employee ID

+-------+-----------+-----------+
| EmpID | StartDate |  EndDate  |
+-------+-----------+-----------+
|   123 | 5/1/2019  | 5/30/2019 |
+-------+-----------+-----------+

Desired Output

+-------+-----------------+--------+
| EmpID | TransactionDate | Amount |
+-------+-----------------+--------+
|   123 | 5/5/2019        |     30 |
|   456 | 4/3/2018        |     50 |
+-------+-----------------+--------+

If i were to do this in SQL, i would write the following code:

select *
from transaction as A
inner join empID_date as B
on A.EmployeeID = B.EmployeeID
and A.TransactionDate >= B.StartDate
and A.TransactionDate <= B.EndDate

is it possible to do this in Excel Power Query? thanks.

回答1:

Do a standard merge and then filter.

Merge the queries with an inner join.
Expand the start and end date columns.
Select columns satisfying your conditions.
Remove extra columns.

let
    Source = < Transaction table source or definition goes here >,
    #"Merged Queries" = Table.NestedJoin(Source, {"EmpID"}, emp_ID, {"EmpID"}, "emp_ID", JoinKind.Inner),
    #"Expanded emp_ID" = Table.ExpandTableColumn(#"Merged Queries", "emp_ID", {"StartDate", "EndDate"}, {"StartDate", "EndDate"}),
    #"Filtered Rows" = Table.SelectRows(#"Expanded emp_ID", each [TransactionDate] >= [StartDate] and [TransactionDate] <= [EndDate]),
    #"Removed Columns" = Table.RemoveColumns(#"Filtered Rows",{"StartDate", "EndDate"})
in
    #"Removed Columns"

来源：https://stackoverflow.com/questions/62332654/power-query-merge-two-tables-based-on-the-transaction-date-between-two-dates

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powerquery