Microsoft Power BI DAX provides various String Functions such as: LEN, LEFT, RIGHT, LOWER, UPPER, MID, SUBSTITUTE, FORMAT, CONCATENATE, CONCATENATEX, REPT, UNICHAR, VALUES, etc. In this article we will how you, How to use Power BI DAX String Functions with examples.
To demonstrate these Power BI DAX String functions, we are going to use the below shown data. As you can see, there are 15 records in this table.
Power BI DAX String Functions
The following series of examples will show you the list of DAX String Functions in Power BI
Power BI DAX LEN Function
The DAX Now function returns the length of a given string. Syntax of this Power BI DAX LEN is as shown below:
LEN(string)
To demonstrate these DAX String functions, we have to use calculated column. In order to create a column, please click on the New Column option under the Home tab, or Modeling tab.
As you can see from the below screenshot, we renamed the default column name as LEN. Below statement will find the length of a charcater string in Department name column
LEN = LEN(EmployeeSales[Department Name])
Let me add this LEN column to the table that we created earlier. Please refer Create Table Report article to understand the steps involved in creating a table
Power BI DAX LEFT Function
The DAX LEFT function is used to return the leftmost characters from a string up to specified index position. The syntax of this Power BI DAX LEFT Function is as shown below:
LEFT(string, position)
Below statement will return leftmost 8 characters from the Department name column
LEFT = LEFT(EmployeeSales[Department Name], 8)
Power BI DAX RIGHT Function
The DAX RIGHT function is used to return rightmost characters from a string up to specified index position. Syntax of Power BI DAX RIGHT Function is as shown below:
RIGHT(string, position)
It return rightmost 6 characters from the Department name column
RIGHT = RIGHT(EmployeeSales[Department Name], 6)
Power BI DAX LOWER Function
The DAX LOWER function converts the given string of characters to lower case. Syntax of Power BI DAX LOWER Function is as shown below:
LOWER(string)
It converts the Department name column into lowercase
LOWER = LOWER(EmployeeSales[Department Name])
Power BI DAX UPPER Function
The DAX UPPER function converts the given string into uppercase. Syntax of Power BI DAX UPPER Function is as shown below:
UPPER(string)
Below statement convert Department name column string into uppercase
UPPER = UPPER(EmployeeSales[Department Name])
Power BI DAX MID Function
The Tableau MID function returns a sub-string from original string. Syntax of this Tableau MID Function is:
The DAX MID function returns a sub-string from original string. Syntax of Power BI DAX MID Function is as shown below:
MID(string, starting_position, length)
This function accepts three arguments:
- Starting position – Sub string start from this position
- Length – Total length of a sub string.
It returns sub string from Department Name column. Sub-string starts at position no 4 and end when string length reaches to 7.
MID = MID(EmployeeSales[Department Name], 4, 7)
Power BI DAX REPT Function
The DAX REPT function is used to repeat a string for user specified number of time. The syntax of this Power BI DAX REPT Function is:
REPT(string, no_of_times)
It repeats the data in LastName column for 2 times
REPT = REPT(EmployeeSales[LastName], 2)
Power BI DAX SUBSTITUTE Function
The DAX SUBSTITUTE function is used to repeat a string for user specified number of time. The syntax of this Power BI DAX SUBSTITUTE Function is:
SUBSTITUTE(string, old_string, new_string)
It replace the Software word with Web inside the Department Name column values
SUBSTITUTE = SUBSTITUTE(EmployeeSales[Department Name], "Software", "Web")
Power BI DAX UNICHAR Function
The DAX UNICHAR function returns the unicode character for the given ASCII value. The syntax of this Power BI DAX UNICHAR Function is:
UNICHAR(number)
It will return the Unicode characters of Yearly income divide by 2
UNICHAR = UNICHAR(EmployeeSales[Yearly Income] / 2)
Power BI DAX EXACT Function
The DAX EXACT function compare two strings, and return true if they are exactly equal otherwise, it returns false. The syntax of this Power BI DAX EXACT Function is:
EXACT(string1, string2)
Below statement will compare Department Name with Leftmost 18 characters of Department Name
EXACT = EXACT(EmployeeSales[Department Name], LEFT(EmployeeSales[Department Name], 18))
Power BI DAX CONCATENATE Function
The DAX CONCATENATE function is used to concatenate two strings. The syntax of this Power BI DAX CONCATENATE Function is:
CONCATENATE(string1, string2)
Below statement concatenate first name and last name
CONCAT = CONCATENATE(EmployeeSales[FirstName], EmployeeSales[LastName])
Power BI DAX CONCATENATEX Function
The DAX CONCATENATEX function is used to concatenate all the rows in a column using the specified delimiter. The syntax of this Power BI DAX CONCATENATEX Function is:
CONCATENATEX(tableName, ColumnName, Delimiter)
Below statement concatenate all the rows in last name column using comma delimiter
CONCATENATEX = CONCATENATEX(EmployeeSales, EmployeeSales[LastName], ",")
Power BI DAX FIXED Function
The DAX FIXED function is used to round the given number t specified number of digits, and returns in text data type. The syntax of this Power BI DAX FIXED Function is:
FIXED(number, decimals, comma)
Below statement rounds sales decimals to single digit, and it will not allow comma
FIXED = FIXED(EmployeeSales[Sales], 1, 1)
Power BI DAX BLANK Function
The DAX BLANK function is used to return blank. You can also use this to check whether the crows has any blanks or not. The syntax of this Power BI DAX BLANK Function is:
BLANK()
Below If statement check whether there are any blanks while dividing Sales by Service Grade. If true then Blank will be replace by 100 other wise, it returns the result.
BLACNK = IF(DIVIDE(EmployeeSales[Sales], EmployeeSales[Service Grade]) = BLANK(),
100, DIVIDE(EmployeeSales[Sales], EmployeeSales[Service Grade]))
From the below screenshot, you can see the result.
Power BI DAX UNICODE Function
The DAX UNICODE function returns the ASCII value of a first character in a string. The syntax of this Power BI DAX UNICODE Function is:
UNICODE(string)
Below statement returns the ASCII value of first character in a last name column
CODE = UNICODE(EmployeeSales[LastName])
Power BI DAX COMBINEVALUES Function
The DAX COMBINEVALUES function is used to combine two or morestrings using the specified delimiter. The syntax of this Power BI DAX COMBINEVALUES Function is:
COMBINEVALUES(Delimiter, string1, string2,..)
Below statement combine First Name, Last Name, Education columns using comma delimiter
CONCATENATEX = CONCATENATEX(EmployeeSales, EmployeeSales[LastName], ",")
Power BI DAX FORMAT Function
The DAX FORMAT function format numbers, and dates to predefined formats. Syntax of Power BI DAX FORMAT Function is:
FORMAT(expression, format_type)
Below statement formats the Sales amount into currency type
FORMAT = FORMAT(EmployeeSales[Sales], "Currency")
Power BI DAX VALUE Function
The DAX VALUE function converts the string numbers into number. Syntax of Power BI DAX VALUE Function is:
VALUE(string)
Below statement converts the string numbers in Fixed function result to number
VALUE = VALUE(EmployeeSales[FIXED])
