Unary Operators

In Multidimensional Expressions (MDX), unary operators perform an operation on a single operand, such as returning the negative or positive value of a numeric expression.

MDX supports the unary operators listed in the following table.

Operator	Description
- (Negative)	Returns the negative value of a numeric expression.
+ (Positive)	Returns the positive value of a numeric expression.

The following example demonstrates the use of a unary operator to return the negative value of a measure:

WITH 
   MEMBER [Measures].[NegDiscountAmount] AS
   -[Measures].[Discount Amount]
SELECT 
   {[Measures].[Discount Amount],[Measures].[NegDiscountAmount]} on COLUMNS,
   NON EMPTY [Product].[Product].MEMBERS  ON Rows
FROM [Adventure Works]
WHERE [Product].[Category].[Bikes]

In addition, MDX uses special unary operators to determine the aggregation operation performed by the RollupChildren function. For more information on these special unary operators, see Adding a Custom Aggregation to a Dimension.

See Also

Concepts

Operators (MDX Syntax)