Ignore Duplicates and Create New List of Unique Values in Excel

Question

I have a column of values that often appear as duplicates  I need to create a new column  of unique values based on the first column  as follows   Column A   Column B   a          a a          b b          c c c   This Column B will actually need to appear on a different sheet  within the same workbook  so I assume it will need to work with the sheet2 A1 style format   I have not had any luck with the Data Filter menu options as this only seems to work on command  I need column B to update automatically whenever a new value is entered into column A

User · Accepted Answer

Totero s answer is correct  The link is also very helpful   Basically the formula you need is   B2 INDEX  A 2  A 20  MATCH 0  COUNTIF  B 1 B1   A 2  A 20   0     Then press ctrl shift enter  or it will not work using a array formula    Two important things to keep in mind here  The complete list is in cells A2 A20  then this formula has to be pasted in cell B2  Not B1 as that will give you circular reference   Secondly this is an array formula  so you need to press ctrl shift enter or it will not work correctly

User · Answer

Another approach  since Excel 2016  is to use Power Query   Howto    select the data  including the field name   use menu Data   From a table or a range   Excel will change your sheet into an Excel Table  which is very convenient   in the Power Query Editor  right-click on ColumnA  the column header   and Remove duplicates  in the menu  choose Close and load  choose where you want the result  and you re done  like this  Whenever you want the result table to update  right-click it and choose Refresh    Benefits     it uses the CPU only when manually updated  which is very convenient for long lists  if you re curious  this offers many other powerful options    Drawbacks     it doesn t update on the fly  you have to right-click and refresh the result table   people with old version of Excel won t be able to refresh the results table

User · Answer

So for this task First Sort your data in order from A to Z or Z to A then you can just use one simple formula as stated below    IF A2 A3   Duplicate    Not Duplicate     The above formula states that if column A2 data   A is column and 2 is row number  is similar to A3  A is Column and 3 is Row number  then it will print Duplicate else will print Not Duplicate   Lets consider an example  Column A consists Email address in which some are duplicate  so in Column 2  I used the above stated formula which in results displayed me the 2 duplicates cells one is Row 2 and Row 6   One you got the duplicate data just put filter on your sheet and make visible only the duplicate data and delete all the unnecessary data

User · Answer

All you have to do is   Go to Data tab Chose advanced in Sort  amp  Filter In actions select   copy to another location if want a new list - Copy to any location  In list range chose the list you want to get the records off    And the most important  thing is to check   Unique records only

User · Answer

To remove duplicates from a column    Sort the values in column A A- Z Select column B While column B is still selected  in the formula input box  enter    IF TRIM A1  TRIM A2     TRIM A1    While Column B is still selected  select Edit -  Fill -  Down   in newer versions  simply select cell B1 and pull down the outer box to expand all the way down in the column    Note  if column B is on another sheet  you may do Sheet1 A1 and Sheet1 A2

User · Answer

SORT UNIQUE A A     The above formula works best if you want to list unique values in a column

User · Answer

Find here mentioned above formula with error control   IFERROR INDEX  B 2  B 9  MATCH 0 COUNTIF  D 1 D1   B 2  B 9   0          where   B2 B9 is the column data which you want to extract the unique values  D1 is the above cell where your formula is located

User · Answer

The MODERN approach is to consider cases where column of information come from a web service such as an OData source  If you need to generate a filter select fields off of massive data that has replicated values for the column  consider the code below    var CatalogURL   getweb currenturl                       api web lists getbytitle  Site 20Inventory 20and 20Assets   items  select Expense x005F x0020 Type amp  orderby Expense x005F x0020 Type       the column that is replicated  is ordered by  lt column name gt          OData read CatalogURL          function data request                var myhtml                  var myValue                   for var i   0  i  lt  data results length  i                                  myValue   data results i  Expense x005F x0020 Type                   if i    0                                            myhtml      lt option value    myValue    gt   myValue   lt  option gt                                      else                 if myValue    data results i-1  Expense x005F x0020 Type                                            myhtml      lt option value    myValue    gt   myValue   lt  option gt                                       else                                                                       mySelect1   append myhtml

User · Answer

On a sorted column  you can also try this idea   B2 A2 B3 IFERROR INDEX A A MATCH B2 A A 1  1        B3 can be pasted down  It will result 0  after the last unique match  If this is unwanted  put some IF statement around to exclude this   Edit   Easier than an IF statement  at least for text-values   B3 IFERROR T INDEX A A MATCH B2 A A 1  1

User · Answer

Honestly I followed these examples to a tee and they simply didn t work   What I ended up doing after struggling pointlessly trying to get Excel to work was to just copy the entire contents of my column to NotePad   where I was able to find an easy solution within minutes   Take a look at this   Removing duplicate rows in Notepad    Edit  Here is a brief overview of how to do it in TextFX   Plugins -  Plugin Manager -  Show Plugin Manager -  Available tab -  TextFX -  Install  After TextFX is installed in NotePad    then you select all your text you want to remove duplicates from  then make sure to check   TextFX -  TextFX Tools -  Sort outputs only UNIQUE lines  Then click  sort lines case sensitive  or  sort lines case insensitive  and it will perform the unique sort

User · Answer

There is a good guide of how to do this here   Basically Something similar to    INDEX Sheet1  A 1  A 20  MATCH 0  COUNTIF  B 1 B1 Sheet  A 1  A 20   0

User · Answer

I have a list of color names in range A2 A8  in column B I want to extract a distinct list of color names   Follow the below given steps    Select the Cell B2  write the formula to retrieve the unique values from a list   IF COUNTIF A 2 A2 A2  1 A2         Press Enter on your keyboard  The function will return the name of the first color  To return the value for the rest of cells  copy the same formula down  To copy formula in range B3 B8  copy the formula in cell B2 by pressing the key CTRL C on your keyboard and paste in the range B3 B8 by pressing the key CTRL V  Here you can see the output where we have the unique list of color names

User · Answer

In my case the excel was frozen when using the formula of  B2 INDEX  A 2  A 20  MATCH 0  COUNTIF  B 1 B1   A 2  A 20   0    because there was many rows  10000   So I did in another way which I show below  I have copied my original list to a second column and then with the function of Excel  quot remove duplicates quot  I could find the list of unique values  Copied from Microsoft Office Website   Select all the rows  including the column headers  in the list   you want to filter  Click the top left cell of the range  and then drag to the bottom right cell  On the Data menu  point to Filter  and then click Advanced Filter  In the Advanced Filter dialog box  click Filter the list  in place  Select the Unique records only check box  and then click OK   The filtered list is displayed and the duplicate rows are hidden  On the Edit menu  click Office Clipboard   The Clipboard task pane is displayed  Make sure the filtered list is still selected  and then click Copy Copy button   The filtered list is highlighted with bounding outlines and the selection appears as an  gt   gt  item at the top of the Clipboard  On the Data menu  point to Filter  and then click Show All   The original list is re-displayed  Press the DELETE key   The original list is deleted  In the Clipboard  click on the filtered list item   The filtered list appears in the same location as the original list   Source  Microsoft Office Website  link removed  cause dead

User · Answer

In the worksheet module for the sheet containing the list   Private Sub Worksheet Change ByVal Target As Range       Dim rngDest As Range      If Not Intersect Target  Me Columns 1   Is Nothing Then          Set rngDest   ThisWorkbook Sheets  Sheet2   Range  A1            Me Range Me Range  A2    Me Cells Rows Count  1  End xlUp   AdvancedFilter               Action  xlFilterCopy  CopyToRange  rngDest  Unique  True      End If  End Sub

[excel] Ignore Duplicates and Create New List of Unique Values in Excel

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