Dax Function: NOT
Category: Logical Functions
The NOT function in Power BI is a logical DAX (Data Analysis Expressions) function that inverts a Boolean value. If the input is TRUE, it returns FALSE, and vice versa.
Purpose
- The NOT function is primarily used for logical negation in DAX expressions.
- It simplifies the creation of logical conditions where the inverse of a Boolean value is required.
Type of Calculations
- Boolean logic-based calculations.
- Useful in conditional statements and filters.
Practical Use Cases
- Negating conditions in calculated columns or measures.
- Creating filters for records that do not meet a specific criterion.
- Simplifying logical expressions.
NOT(<logical>)
| Parameter | Type | Description |
|---|---|---|
| logical | Scalar | A Boolean expression or a logical value (TRUE or FALSE). |
How Does NOT Dax Function Works?
The NOT function evaluates a logical expression provided as its parameter and inverts the result. For instance:
- If the input is a logical value like
TRUE, it directly returns the opposite (FALSE). - If the input is an expression that evaluates to
TRUEorFALSE, it calculates the result first and then inverts it.
Logical Principle
The function adheres to the negation principle:
- NOT(TRUE) =
FALSE - NOT(FALSE) =
TRUE
What Does It Return?
The NOT function returns a Boolean value:
TRUEif the input isFALSE.FALSEif the input isTRUE.
When Should We Use It?
- Negating Filters: Use when you want to exclude records based on a specific condition.
- Complex Logical Conditions: Simplify expressions that require inversions.
- Boolean-Based Calculations: Create conditional columns or measures with negated logic.
Examples
Basic Usage
Invert a Boolean value:
Result = NOT(TRUE)
Output: FALSE
Column Usage:
Negate a condition in a calculated column:
Is Not Profitable = NOT(Sales[Profit] > 0)
Explanation: If Sales[Profit] > 0 evaluates to TRUE, the column value will be FALSE, and vice versa.
Advanced Usage
Combine with other logical functions:
Low Revenue = NOT(AND(Sales[Revenue] > 1000, Sales[Region] = "North"))
Explanation: Returns TRUE if either Sales[Revenue] <= 1000 or Sales[Region] ≠ "North".
Tips and Tricks
- Simplify Complex Logic: Use NOT to simplify expressions instead of writing out negated conditions manually.
- For example,
NOT(A)is simpler thanA = FALSE.
- For example,
- Performance Optimization: Ensure the
logicalparameter is straightforward to evaluate for better performance in large datasets. - Combine with Logical Functions: Combine with AND, OR, and IF for dynamic and complex conditions.
Performance Impact of NOT DAX Function:
- Works efficiently with simple Boolean expressions.
- When used in calculated columns, ensure conditions are optimized to prevent unnecessary performance overhead.
Related Functions You Might Need
- AND: Combines multiple conditions and returns
TRUEif all are true. - OR: Combines multiple conditions and returns
TRUEif at least one is true. - IF: Implements conditional logic based on a Boolean expression.
- ISBLANK: Checks if a value is blank (can be used with NOT for non-blank checks).
Want to Learn More?
For more information, check out the official Microsoft documentation for NOT. You can also experiment with this function in your Power BI reports to explore its capabilities.
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The NOT function inverts a Boolean value. It returns TRUE if the input is FALSE and FALSE if the input is TRUE.
No, the input to NOT must be a Boolean expression or logical value.
Use NOT in filters to exclude records based on specific conditions.
Yes, it is often combined with AND, OR, or IF to create complex logical conditions.
Yes, for simple logical expressions. For complex conditions, ensure optimization of the input expressions.
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