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DAX LOWER Function

The DAX LOWER function in Power BI is used to convert all characters in a text string to lowercase. This function is particularly useful for standardizing text data, ensuring consistency in text values, and performing case-insensitive comparisons.


Syntax:

LOWER(<text>)

<text>: The text string that you want to convert to lowercase.


Purpose:

The LOWER function helps you ensure that text data is consistently formatted in lowercase. This is essential for tasks like data cleaning, preparing text for comparisons, and ensuring uniformity in text-based fields.


Example:

Suppose you have a table named "Customers" with a column "Email" that contains email addresses in mixed case. You want to create a new column that shows all email addresses in lowercase.

You can use the LOWER function as follows:

LowercaseEmail = LOWER(Email[Email])


Example Scenario:

Assume you have the following "Customers" table:



Using the LOWER function, you can convert all email addresses to lowercase:

LowercaseEmail = LOWER(Customers[Email])

The resulting table would be:




Handling Edge Cases:

If the <text> is already in lowercase, the function returns the same text.

If the <text> contains non-alphabetic characters, they remain unchanged.

If the <text> is an empty string, LOWER returns an empty string.


Combining with Other Functions:

You can combine the LOWER function with other DAX functions to perform more complex text manipulations and comparisons.


Related Functions:

UPPER: Converts a text string to all uppercase letters.

TRIM: Removes all spaces from a text string except for single spaces between words.

LEN: Returns the number of characters in a text string.

CONCATENATE: Joins two text strings into one.

MID: Returns a specific number of characters from a text string, starting at the position you specify.

LEFT: Returns the specified number of characters from the start of a text string.

RIGHT: Returns the specified number of characters from the end of a text string.


The LOWER function in Power BI is a straightforward but essential tool for text standardization and case-insensitive data handling. Understanding how to use the LOWER function effectively allows you to clean and prepare text data, ensuring consistency and reliability in your Power BI reports and analyses.



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