Daily DAX : Day 464 ISDOUBLE

Power BI DAX Function ISDOUBLE 

The ISDOUBLE function in Power BI (DAX) is a relatively straightforward but essential information function. Its primary purpose is to check whether a value or an expression results in a Double (a double-precision floating-point) data type.


How it Works

The function returns a simple Boolean value:

    • TRUE: If the value is a Double (decimal number).

    • FALSE: If the value is any other data type (String, Integer, Date, Boolean, etc.).

Syntax

ISDOUBLE(<value>)


Why use ISDOUBLE?

In DAX, "Double" is the data type used for Decimal Numbers. While it might seem obvious what a number is, DAX distinguishes between Integers (whole numbers) and Doubles (numbers with potential decimals).

Key Use Cases

    • Data Validation: Before performing complex scientific or financial calculations that require high precision, you can use ISDOUBLE to ensure the input data is in the correct format.

    • Conditional Logic in Measures: You can use it within an IF statement to apply different logic based on the data type of a column or a selected measure.

    • Error Handling: It helps prevent calculation errors if a column accidentally contains mixed types or if a calculation might result in a non-numeric format.


Practical Example

Imagine you have a "Product Price" column. Some prices are whole numbers (Integers), and others have decimals (Doubles). If you want to create a label that identifies which prices are precise decimals, you could write:

Code snippet

Price Type = 

IF(

    ISDOUBLE('Sales'[Unit Price]), 

    "Decimal/Floating Point", 

    "Whole Number/Other"

)

Note: If you are checking if a value is any kind of number (either Integer or Double), you would typically use the ISNUMBER function instead. ISDOUBLE is more specific to the floating-point storage format.


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