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Expression Editor
Expression Editor
Expressions combine or manipulate one or more pieces of data into a new piece of data using mathematical or boolean logic, as well as a set of built-in functions; therefore, they must follow the standard algebraic rules for order of operations.
Logical Functions in Expressions
Logical functions perform an operation or comparison on objects and expressions.

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- Expression Editor
  - Expression Editor
    Expressions combine or manipulate one or more pieces of data into a new piece of data using mathematical or boolean logic, as well as a set of built-in functions; therefore, they must follow the standard algebraic rules for order of operations.
    - Expression Functions
      A function performs a calculation between values in order to produce another value. When functions are used in an expression, they aid in the expression's evaluation.
    - Math Functions in Expressions
      Math functions are used for mathematical calculations in an expression.
    - Conversion Functions in Expressions
      Conversion functions convert expressions of one data type to another data type when data type conversions are not automatically performed by SQL Server.
    - Logical Functions in Expressions
      Logical functions perform an operation or comparison on objects and expressions.
    - Text Functions in Expressions
      Text functions perform an operation on a string input value and return a string or numeric value.
    - Date Functions in Expressions
      Date functions perform an operation on a date and time input value and return a string, numeric, or date and time value.
    - Expression Operators
      An operator performs an operation in an expression on one or more elements that hold value.
    - Expression Variables
      Variables are previously configured components in Workflow models that can be included in an expression for evaluation.
    - String, Numeric, and Boolean Literals in Expressions
      A literal is a textual representation of a particular value in an expression.
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Logical Functions in Expressions

Logical functions perform an operation or comparison on objects and expressions.

Logical

The following information describes the functions available for building expressions.

Function	Syntax	Description	Example
If	IF(boolean_condition, expression1, expression2)	If the condition evaluates to True, expression1 is returned. If the condition evaluates to False, expression2 is returned. Note: This function accepts any type for its second and third parameters, as long as they are both of the same type.	IF (5>4, 1, 0) = 1
IsNull	IsNull(object)	Determines whether or not a given expression is type DBNull.	IsNull(myLocalVariable)