ISLOGICAL DAX Function (Information)
Checks whether a value is a logical value (TRUE or FALSE), and returns TRUE or FALSE. This is an alias of ISBOOLEAN.
Syntax
ISLOGICAL ( <Value> )
| Parameter | Attributes | Description |
|---|---|---|
| Value |
The value you want to test. |
Return values
Scalar A single boolean value.
TRUE if the value is a logical value; FALSE if any value other than TRUE or FALSE.
Remarks
When applied to a column reference as expression, this functions tests the data type of the column and not whether it is possible to execute a type conversion to a Boolean.
Examples
-- ISLOGICAL, ISTEXT, ISNONTEXT and ISNUMBER check their argument
-- for the required data type.
--
-- Different results with strings, numbers, Booleans, and BLANK
EVALUATE
VAR _Logical = TRUE
VAR Number = -1.2
VAR Txt = "SQLBI"
VAR ValueTable =
{
( "ISLOGICAL(Value)", ISLOGICAL ( _Logical ), ISLOGICAL ( Number ), ISLOGICAL ( Txt ), ISLOGICAL ( BLANK () ) ),
( "ISNUMBER (Value)", ISNUMBER ( _Logical ), ISNUMBER ( Number ), ISNUMBER ( Txt ), ISNUMBER ( BLANK () ) ),
( "ISTEXT(Value)", ISTEXT ( _Logical ), ISTEXT ( Number ), ISTEXT ( Txt ), ISTEXT ( BLANK () ) ),
( "ISNONTEXT(Value)", ISNONTEXT ( _Logical ), ISNONTEXT ( Number ), ISNONTEXT ( Txt ), ISNONTEXT ( BLANK () ) )
}
RETURN
SELECTCOLUMNS(
ValueTable,
"Function Call VALUE = ",[Value1],
"TRUE", [Value2],
"-1.2", [Value3],
"""SQLBI""", [Value4],
"BLANK()", [Value5]
)
| Function Call VALUE = | TRUE | -1.2 | “SQLBI” | BLANK() |
|---|---|---|---|---|
| ISLOGICAL(Value) | true | false | false | false |
| ISNUMBER (Value) | false | true | false | false |
| ISTEXT(Value) | false | false | true | false |
| ISNONTEXT(Value) | true | true | false | true |
-- ISLOGICAL, ISTEXT, ISNONTEXT and ISNUMBER check their argument
-- for the required data type.
--
-- Different results with strings, numbers, booleans, BLANK
EVALUATE
VAR ValueToCheck = "SQLBI"
RETURN
{
( "ISLOGICAL (" & ValueToCheck & ")" , ISLOGICAL ( ValueToCheck )),
( "ISTEXT (" & ValueToCheck & ")" , ISTEXT ( ValueToCheck )),
( "ISNONTEXT (" & ValueToCheck & ")" , ISNONTEXT ( ValueToCheck )),
( "ISNUMBER (" & ValueToCheck & ")" , ISNUMBER ( ValueToCheck ))
}
| Value1 | Value2 |
|---|---|
| ISLOGICAL (SQLBI) | false |
| ISTEXT (SQLBI) | true |
| ISNONTEXT (SQLBI) | false |
| ISNUMBER (SQLBI) | false |
Related functions
Other related functions are:
Last update: Oct 22, 2025 » Contribute » Show contributors
Contributors: Alberto Ferrari, Marco Russo, Kenneth Barber
Microsoft documentation: https://docs.microsoft.com/en-us/dax/islogical-function-dax
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