使用Power Query为指定单元格填充递增RefID值的方案咨询

1. Filling TypeB RefIDs Without VLOOKUP (Preserving Original Structure) #

Use Power Query to merge your original table with the generated RefID table, then overwrite the original table with the cleaned result (column structure remains identical):

• Step 1: In Power Query, create two queries: one referencing your original named table (Sheet1), another referencing the Sheet2 table with generated TypeB RefIDs.
• Step 2: Merge the two queries using unique identifier columns (e.g., UserID, Email—any columns that uniquely identify each user row). Choose a left outer join to retain all rows from the original table.
• Step 3: Expand the merged column to extract the generated RefID from Sheet2.
• Step 4: Add a custom column for RefID:

  = if [OriginalRefID] <> null then [OriginalRefID] else [GeneratedRefID]
  

  (Replace OriginalRefID and GeneratedRefID with your actual column names.)
• Step 5: Remove the extra generated RefID column, so your query output has exactly the same columns as the original table.
• Step 6: Load the query result back to the original named table (select "Overwrite existing" when prompted). This replaces only the null RefIDs with the generated values, keeping all other data and table structure intact.

Alternative manual method (if you prefer not to overwrite via PQ): Load the merged query to a new sheet, then copy the entire table, paste values only back to Sheet1's original table.

2. Benefits of Having the Sender Use PQ to Generate the Original Table #

Yes, this will significantly streamline future merge and update workflows:

• Structured, reproducible data: The original table will be a query output, so it’s consistently formatted and easy to reference in your PQ workspace (no unstructured ranges or hidden formatting issues).
• Seamless integration: You can modify the sender’s existing PQ to include your TypeB RefID generation step directly, instead of creating separate queries for filtering and merging. This reduces redundant steps.
• Simplified updates: If the sender needs to revise the original data, they can re-run their PQ to generate the latest table. Your merge query will automatically pick up the changes when refreshed, eliminating manual rework.
• Consistent key columns: Using PQ ensures unique identifiers (critical for merging) are preserved and formatted correctly, reducing merge errors.

内容的提问来源于stack exchange，提问作者Reg_info