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LEFT()
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LEFT() is pretty straightforward and probably self-explanatory if you have used Excel, Visual Basic for Applications (VBA), or SQL before Unlike the Excel version, it can operate against columns (as shown here) as well as against literal text or numeric values as a reminder, the DAX functions don t operate on worksheet cells The example is a calculated column in the Customers table
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=LEFT('Customers'[Country],3) & "-" & 'Customers'[CustomerID]
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The formula is creating a new identifier for each customer This new identifier is the old primary key prefixed by the first three letters of the country and a hyphen If you add this to your pivot table rows, you can right-click to sort on country and old primary key I ve been a little lazy here the concatenation is done with ampersands rather than a nested CONCATENATE()
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LEN()
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Again, the LEN() function is very similar to the old Excel equivalent, except it can accept a column as a parameter The example is a Products table calculated column
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Syntax
=LEN('Products'[QuantityPerUnit])
Prac tical PowerPivot & DAX Formulas for Excel 2010
Result
Analysis
The returned length of the QuantityPerUnit column includes any embedded spaces Each character counts as 1, even if your data is in 2-byte Unicode
LOWER()
The LOWER() function simply converts a string or a column containing a text value into lowercase The example is a Products table calculated column
Syntax
=LOWER('Products'[ProductName])
Result
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Analysis
There s nothing very sophisticated here Often, the text functions are used in combination to provide meaningful manipulation of data Any good book on Excel functions and formulas will contain lots of interesting examples but please remember that the DAX versions of the Excel functions can usually accept columns as input parameters
MID()
The MID() function strips out a substring from a text column or text value (it also works on numeric columns and values) The example is a Products table calculated column
Syntax
=MID('Products'[ProductName],2,3)
Result
Analysis
The result is a three-character string starting at the second character of the ProductName column
Prac tical PowerPivot & DAX Formulas for Excel 2010
REPLACE()
The REPLACE() function is potentially more useful! I don t think you ll be too surprised if the REPLACE() function replaces some existing text There is also a SUBSTITUTE() function that replaces text, but it does so in a different way SUBSTITUTE() is covered shortly The example is a Customers table calculated column
Syntax
=REPLACE('Customers'[CustomerID],4,2,"XXX")
Result
Analysis
Here s an example of how to create a new identifier for each customer The formula replaces two characters starting from position 4 with the characters XXX
REPT()
The REPT() function repeats a nominated string a number of times The examples are Customers table calculated columns
Syntax
='Customers'[CustomerID] & REPT("",3) =LEFT('Customers'[CustomerID],3) & REPT("X",3)
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Result
Analysis
The first example adds three trailing dots to the CustomerID column, the result shown The second one has the same result as the previous example formula for REPLACE()
RIGHT()
The RIGHT() function returns a specified number of characters from the end of a text column or literal string value (trailing spaces count as characters) The example is a Customers table calculated column
Syntax
=RIGHT('Customers'[CustomerID],3) & LEFT('Customers'[CustomerID],2)
Result
Prac tical PowerPivot & DAX Formulas for Excel 2010
Analysis
Here we are jiggling with the customer identifier
SEARCH()
The SEARCH() function is the same as FIND() apart from case sensitivity The examples are calculated columns on any table
Syntax
=SEARCH("e","bottles",1) =SEARCH("E","bottles",1)
Result
Analysis
SEARCH(), just like FIND(), only works on literal values It s not possible to search a column if you try, you ll receive an error The third parameter is the start position for the search SEARCH() is not case-sensitive, so both examples work
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SUBSTITUTE()
The SUBSTITUTE() function is slightly different from the REPLACE() function The example is a Products table calculated column
Syntax
=SUBSTITUTE('Products'[QuantityPerUnit],"oz","ounce",1)
Result
Analysis
Instead of a number of characters to replace (as in the REPLACE() function), you specify a replacement string Here we are changing oz to ounce The third parameter is the number of the occurrence to replace (or all occurrences if omitted); SUBSTITUTE() is case-sensitive
TRIM()
Use TRIM() to remove leading and trailing space characters The example is a Customers table calculated column
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