Excel Guides

Unique Name Entry Take Two in Excel

If you have a list of names in an Excel spreadsheet that you want to make sure are unique, there are a few ways you can go about it. One way is to use the Data Validation feature to ensure that only unique values are entered into a column. Another way is to use the COUNTIF function to count the number of times each value appears in the column.

Using Data Validation

To use data validation, select the cells in the column that you want to check for uniqueness. Then, go to the Data tab on the ribbon and click Data Validation. In the Settings tab, select Custom from the Allow drop-down list. In the Formula box, enter the following formula:

=COUNTIF($A$1:$A$10000,A1)=1

This formula will count the number of times each value appears in the column. If a value appears more than once, it will return false and data validation will prevent it from being entered. You can change the range in the formula ($A$1:$A$10000) to match the size of your data set.

Using COUNTIF

Another way to check for uniqueness is to use the COUNTIF: function. This function counts how many times a given value appears in a range of cells. To use it, enter the following formula in a cell next to your data:

=COUNTIF($A$1:$A$10000,A1)

This will count how many times each value appears in your data set. If any values appear more than once, they will have a count greater than 1.

You can also use COUNTIF to find duplicates within your data set. To do this, enter the following formula in a cell next to your data:

=COUNTIF($A$1:$A$10000,A1)>1

This will return TRUE if any values appear more than once in your data set.

Finding Uniques with VLOOKUP

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