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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.

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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.

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.

You can build simple or complex expressions. They are user-defined and consist of one or more of the following components:

Functions
Operators
Variables
Literals

The following table describes the general attributes that are available in all expression editor dialog boxes:

Attribute	Value	Description
Enter Expression	User-defined	Specifies an expression using the available functions, variables, values, and operators.
Operator buttons	System-defined	Click to insert an operator into your expression.
Check Syntax	System-defined	Click to confirm if an expression has been completed and ordered correctly.
Test	System-defined	Click to evaluate the expression. The Test Expression dialog box appears.
Test Expression dialog box	N/A	Click the Test button to open this dialog box. Click Evaluate to evaluate the expression. Or, if you use a predefined variable as part of your expression, enter the value here.
Functions tab	N/A	Displays the functions available to build your expression. Double-click a function to insert it into your expression.
Variables tab	N/A	Displays the variables available to build your expression. Double-click a variable to insert it into your expression.
Workflow Variables tab	N/A	Displays the workflow variables available to build your expression. This tab is only available when you are in a workflow.

Note: The property you are creating an expression for and its data type are displayed in the Expression Editor in the upper left and upper right, respectively.