# UNIQUE

In this comprehensive guide, we will explore the UNIQUE function in Excel, which is a powerful tool for extracting unique values from a range or an array. The UNIQUE function is available in Excel for Microsoft 365 and Excel for the web. It is particularly useful when working with large datasets where you need to identify and extract distinct values. This article will cover the syntax of the UNIQUE function, provide examples of its use, share tips and tricks, discuss common mistakes, troubleshoot issues, and introduce related formulae.

## UNIQUE Syntax

The syntax for the UNIQUE function in Excel is as follows:

UNIQUE(array, [by_col], [occurs_once])

There are three arguments in the UNIQUE function:

1. array (required): This is the range or array from which you want to extract unique values.
2. by_col (optional): This is a logical value (TRUE or FALSE) that specifies whether to compare values by row or by column. The default value is FALSE, which means that the function will compare values by row.
3. occurs_once (optional): This is a logical value (TRUE or FALSE) that specifies whether to return only unique values that occur once or all unique values. The default value is FALSE, which means that the function will return all unique values.

## UNIQUE Examples

Let’s look at some examples of how to use the UNIQUE function in Excel:

1. Basic example: Suppose you have a list of names in column A, and you want to extract a list of unique names. You can use the following formula:
2. =UNIQUE(A1:A10) This formula will return an array of unique names from the range A1:A10.

3. Extract unique values by column: If you have a dataset with multiple columns and you want to extract unique values by comparing columns, you can use the by_col argument. For example, if you have a dataset in the range A1:C10, you can use the following formula:
4. =UNIQUE(A1:C10, TRUE) This formula will return an array of unique values by comparing columns in the range A1:C10.

5. Extract values that occur only once: If you want to extract unique values that occur only once in a range, you can use the occurs_once argument. For example, if you have a list of numbers in column A and you want to extract numbers that appear only once, you can use the following formula:
6. =UNIQUE(A1:A10, FALSE, TRUE) This formula will return an array of unique numbers from the range A1:A10 that occur only once.

7. Extract unique values from multiple columns: If you have a dataset with multiple columns and you want to extract unique values based on the combination of values in those columns, you can use the following formula:
8. =UNIQUE(A1:B10) This formula will return an array of unique values based on the combination of values in columns A and B in the range A1:B10.

## UNIQUE Tips & Tricks

Here are some tips and tricks to help you get the most out of the UNIQUE function in Excel:

1. Use the UNIQUE function with other functions like SORT and FILTER to further manipulate and analyze your data. For example, you can use the following formula to extract unique values from a range and sort them in ascending order:
2. =SORT(UNIQUE(A1:A10))

3. If you want to count the number of unique values in a range, you can use the COUNTA function with the UNIQUE function. For example, to count the number of unique names in column A, you can use the following formula:
4. =COUNTA(UNIQUE(A1:A10))

5. When working with large datasets, the UNIQUE function can be resource-intensive. To improve performance, consider using dynamic arrays or limiting the range of data you’re working with.

## Common Mistakes When Using UNIQUE

Here are some common mistakes to avoid when using the UNIQUE function in Excel:

1. Using the UNIQUE function in a version of Excel that does not support it. The UNIQUE function is only available in Excel for Microsoft 365 and Excel for the web. If you’re using an older version of Excel, you may need to use alternative methods to extract unique values, such as using an array formula with the IF, INDEX, MATCH, and COUNTIF functions.
2. Not specifying the correct arguments for the UNIQUE function. Remember that the by_col and occurs_once arguments are optional and have default values of FALSE. Make sure to set these arguments to TRUE if you want to compare values by column or return values that occur only once, respectively.

## Why Isn’t My UNIQUE Function Working?

If your UNIQUE function isn’t working as expected, consider the following troubleshooting steps:

1. Check your Excel version. The UNIQUE function is only available in Excel for Microsoft 365 and Excel for the web. If you’re using an older version of Excel, you’ll need to use alternative methods to extract unique values.
2. Ensure that you’ve entered the correct arguments for the UNIQUE function. Double-check the range or array you’re working with, and make sure you’ve specified the by_col and occurs_once arguments correctly if needed.
3. Check for errors in your data. The UNIQUE function may not return the expected results if there are errors, inconsistencies, or duplicates in your data. Clean and preprocess your data before using the UNIQUE function to ensure accurate results.

## UNIQUE: Related Formulae

Here are some related formulae that you may find useful when working with the UNIQUE function in Excel:

1. SORT: The SORT function sorts the contents of a range or array. You can use it in combination with the UNIQUE function to sort the unique values in a range.
2. FILTER: The FILTER function filters a range or array based on a specified condition. You can use it with the UNIQUE function to filter unique values that meet specific criteria.
3. INDEX: The INDEX function returns the value of a cell in a specified range or array. You can use it with the UNIQUE function to extract unique values from a range or array.
4. MATCH: The MATCH function searches for a specified value in a range or array and returns the relative position of that value. You can use it with the UNIQUE function to find the position of unique values in a range or array.
5. COUNTIF: The COUNTIF function counts the number of cells in a range that meet a specified condition. You can use it with the UNIQUE function to count the number of unique values in a range that meet specific criteria.

In conclusion, the UNIQUE function in Excel is a powerful tool for extracting unique values from a range or an array. By understanding its syntax, using it in various scenarios, and combining it with other functions, you can efficiently analyze and manipulate your data. Remember to avoid common mistakes and troubleshoot any issues to ensure accurate results.

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