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.

» 4 related articles
» 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:

Related functions

Other related functions are:

Last update: Mar 13, 2024   » 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.

Volatile

A volatile function may return a different result every time you call it, even if you provide the same arguments. Click to read more.

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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