Comment mettre en évidence les doublons dans Google Sheets

How to Highlight Duplicates in Google Sheets

To highlight duplicates in Google Sheets, you can use conditional formatting. Here's a step-by-step guide to achieve this:

1. Select the Range: Click and drag to select the range of cells where you want to identify duplicates.
2. Open Conditional Formatting: Go to the menu bar and click on Format, then select Conditional formatting.
3. Add a Rule: In the Conditional format rules sidebar that appears on the right, click on Add another rule.
4. Choose the Format Cells if... Option: Under the Format cells if... dropdown menu, select Custom formula is.

5. Enter the Formula: In the formula field, you will enter a formula depending on whether you want to highlight all occurrences or just the second and subsequent occurrences of duplicates.

   • To highlight all duplicates: Use the formula =COUNTIF(A:A,A1)>1, replacing A:A with your column range and A1 with the first cell in your selected range.
   • To highlight duplicates excluding the first instance: Use the formula =COUNTIF(A$1:A1,A1)>1, again replacing A$1:A1 and A1 according to your range.
6. Choose Formatting Style: Below the formula field, select the formatting style you want to use to highlight the duplicates (e.g., fill color, text color, etc.).
7. Apply the Rule: Click Done to apply the rule. The duplicates in your selected range will now be highlighted according to the formatting you chose.

What is the formula for identifying duplicates in Google Sheets?

The formula for identifying duplicates in Google Sheets depends on whether you want to highlight all occurrences of duplicates or just the second and subsequent occurrences. Here are the two common formulas used:

• To highlight all duplicates: Use the formula =COUNTIF(range,cell)>1. For example, if your data is in column A, you would use =COUNTIF(A:A,A1)>1. This formula counts how many times the value in cell A1 appears in column A, and if it's more than once, it's a duplicate.
• To highlight duplicates excluding the first instance: Use the formula =COUNTIF(range,cell)>1. For example, if your data is in column A, you would use =COUNTIF(A$1:A1,A1)>1. This formula counts how many times the value in cell A1 appears in the range from A1 to the current row. If it's more than once, it's a duplicate but does not include the first instance.

Both of these formulas can be applied using conditional formatting in Google Sheets.

Can conditional formatting be used to highlight duplicates in Google Sheets?

Yes, conditional formatting can be used to highlight duplicates in Google Sheets. The process involves setting up a rule using a custom formula that checks for duplicates within a specified range. Here is how to do it:

1. Select the Range: Choose the range of cells you want to check for duplicates.
2. Open Conditional Formatting: Go to Format > Conditional formatting.
3. Add a Rule: Click Add another rule.
4. Select Custom Formula: In the Format cells if... dropdown, select Custom formula is.
5. Enter the Formula: Use either =COUNTIF(range,cell)>1 to highlight all duplicates or =COUNTIF(range,cell)>1 to highlight duplicates excluding the first instance, adjusting the range and cell to match your selected data range.
6. Choose Formatting Style: Select the style of highlighting you want to use (e.g., fill color, text color).
7. Apply the Rule: Click Done to apply the rule and see the duplicates highlighted.

Conditional formatting provides a flexible and visual way to identify duplicates in your Google Sheets data.

Is there a way to automatically remove duplicates after highlighting them in Google Sheets?

Yes, there is a way to automatically remove duplicates after highlighting them in Google Sheets, though it involves using a script or a combination of features. Here's how you can do it:

1. Highlight Duplicates: First, follow the steps mentioned above to highlight the duplicates using conditional formatting.

2. Use a Script to Remove Duplicates: You can write a Google Apps Script to remove the highlighted cells. Here's a basic example:

   • Open Script Editor: Go to Extensions > Apps Script.

   • Create a Function: Paste the following script into the editor:

     function removeHighlightedDuplicates() {
       var sheet = SpreadsheetApp.getActiveSheet();
       var range = sheet.getDataRange();
       var values = range.getValues();
       
       for (var i = values.length - 1; i >= 0; i--) {
         for (var j = values[i].length - 1; j >= 0; j--) {
           var cell = sheet.getRange(i + 1, j + 1);
           if (cell.getBackground() !== '#ffffff') { // Assuming duplicates are highlighted with a non-white background
             sheet.deleteRow(i + 1);
             break;
           }
         }
       }
     }

   • Save and Run: Save the script and run the function removeHighlightedDuplicates from the script editor.

3. Alternative Method Using Built-in Feature: If you don't want to use scripts, you can use the Remove duplicates feature in Google Sheets, but this won't be based on highlighting:

   • Select the Range: Choose the range where you want to remove duplicates.
   • Go to Data Menu: Click Data > Remove duplicates.
   • Select Columns: Choose the columns you want to check for duplicates and click Remove duplicates.

Note that the built-in Remove duplicates feature doesn't consider the highlighting but can still be used to remove duplicates based on specific column values.

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