
Explanation/Reference:
Explanation:
There are two important sort properties that must be set for the source or upstream transformation that supplies data to the Merge and Merge Join transformations:
The Merge Join Transformation requires sorted data for its inputs.
The IsSorted property of the output that indicates whether the data has been sorted. This property must

be set to True.
The SortKeyPosition property of output columns that indicates whether a column is sorted, the column's

sort order, and the sequence in which multiple columns are sorted. This property must be set for each column of sorted data.
If you do not use a Sort transformation to sort the data, you must set these sort properties manually on the source or the upstream transformation.
References: https://docs.microsoft.com/en-us/sql/integration-services/data-flow/transformations/sort-data- for-the-merge-and-merge-join-transformations