LEFT DAX Function (Text)

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

Syntax

LEFT ( <Text> [, <NumberOfCharacters>] )
Parameter Attributes Description
Text

The text string containing the characters you want to extract.

NumberOfCharacters Optional

The number of characters you want LEFT to extract; if omitted, 1.

Return values

Scalar A single string value.

A text string.

» 1 related article
» 2 related functions

Examples

--  LEFT, RIGHT, MID and LEN are the basic string-manipulation functions
DEFINE 
    VAR Val = "DAX is so cool!"
EVALUATE
{
    ( "LEFT ( Val, 3 ) ",   LEFT  ( Val, 3     ) ),
    ( "RIGHT ( Val, 5 )",   RIGHT ( Val, 5     ) ),
    ( "MID ( Val, 11, 4 )", MID   ( Val, 11, 4 ) ),
    ( "LEN ( Val )",        LEN   ( Val        ) )
}
Value1 Value2
LEFT ( Val, 3 ) DAX
RIGHT ( Val, 5 ) cool!
MID ( Val, 11, 4 ) cool
LEN ( Val ) 15

Related articles

Learn more about LEFT in the following articles:

  • From SQL to DAX: String Comparison

    In DAX string comparison requires you more attention than in SQL, for several reasons: DAX doesn’t offer the same set of features you have in SQL, a few text comparison functions in DAX are only case-sensitive and others only case-insensitive,… » Read more

Related functions

Other related functions are:

Last update: Jul 24, 2021   » Contribute   » Show contributors

Contributors: Alberto Ferrari, Marco Russo

Microsoft documentation: https://docs.microsoft.com/en-us/dax/left-function-dax

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Context Transition

This function performs a Context Transition if called in a Row Context. Click to read more.

Row Context

This expression is executed in a Row Context. Click to read more.

Iterator

Not recommended

The use of this function is not recommended. See Remarks and Related functions for alternatives.

Not recommended

The use of this parameter is not recommended.

Deprecated

This function is deprecated. Jump to the Alternatives section to see the function to use.

Deprecated

This parameter is deprecated and its use is not recommended.

DirectQuery compatibility

Limitations are placed on DAX expressions allowed in measures and calculated columns.
The state below shows the DirectQuery compatibility of the DAX function.

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