5

How can I deduplicate a table (all rows and columns) based on the values in column A?

Example:

Table with duplicates in column A

What I want after deduplicating:

Duplicates values removed from column <code>A</code>, all other rows/columns filtered based on the changes

Basically, I only want unique values in column A, but I want all the other data to persist in the other columns, including cells with null values.

Also, all columns are derived from the =IMPORTDATA() function in the first cell of column A.

7

I found a way to do it:

  1. Select Column A and "Insert 1 left" to add a column. Your table data is moved over one to columns B - D.
  2. In your newly blank Cell A2, enter formula
    =IF(COUNTIF($B$2:$B2,B2)=1, "Unique", "Duplicate")
  3. Copy the formula from A1 and paste it down the A column range for as far as you have data. The "$" absolute references will ensure everything works smoothly.
  4. Add a new sheet. Copy and paste your old sheet's B - D column headers to the new sheet's A - C.
  5. In the your new sheet's cell A2, enter formula
    =FILTER(OldSheet!B2:D5, OldSheet!A2:A5 = "Unique")
  6. Your new sheet now has your old sheets data -- Deduplicated!

I use it with ImportRange to separate Data Entry from Data Processing, so ImportData shouldn't present a problem.

You can hide the A column on your old sheet if you like.

Best of all, everything updates live on edit. So you can continue adding data to OldSheet and NewSheet will be always be current with filtered rows.

  • E - X - C - E - L - L - E - N - T – Happy Bird May 9 '18 at 13:19
4

I think:

deduplicate a table (all rows and columns) based on the values in Column A

is not compatible with

I only want unique values in column A, but I want all the other data to persist in the other columns, including cells with null values

so choosing the latter:

=UNIQUE(x:x)  

might serve where x represents whatever the column reference is for "ColumnA".

If the results are required in ColumnA, select the column with the formula, Copy, Paste special, Paste values only over the top then copy the result over the top of ColumnA.

If importdata brought in more than one column some additional rearrangement may be necessary.

  • Thanks, I edited my question to clarify Column A. – iamfrancisyo Oct 16 '14 at 3:14
0

Move the column you want to make unique on the target sheet to the leftmost postions (make it column A). Create another sheet. On this new sheet make =UNIQUE() for the column on the target sheet you want to be unique. Then, on this new sheet, make =VLOOKUP() in next columns, with unique column as criteria and the target sheet working range as range, for each column of the target working range. This will be equivalent to deleting all rows with the value in the firs column which have already been present somewhere up the range (VLOOKUP works lazy, until the first match).

-1

I was unable to use =UNIQUE successfully. Here's what worked for me:

  1. Paste values of sheet into Excel
  2. Use the Advanced Filter tool
  3. For the List range, select the column containing dupes
  4. For the Criteria range select the whole sheet to be filtered
  5. Select Unique records only

This resulted in a filtered range of data, based on the deduplication of Column A. Still not sure how I'd achieve this in Google Sheets.

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