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Applies to: 
SQL Server Analysis Services
Performs an arithmetic operation that subtracts one number from another number.
Numeric_Expression - Numeric_Expression
Numeric_Expression
A valid Data Mining Extensions (DMX) expression that returns a numeric value.
A value that has the data type of the parameter that has the higher precedence.
Both expressions must be of the same data type, or one expression must be able to be implicitly converted to the data type of the other expression. If one expression evaluates to a null value, the operator returns the result of the other expression.
Arithmetic Operators (DMX)
Data Mining Extensions (DMX) Operator Reference
Operators (DMX)