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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.
String, Numeric, and Boolean Literals in Expressions
A literal is a textual representation of a particular value in an expression.

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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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String, Numeric, and Boolean Literals in Expressions

A literal is a textual representation of a particular value in an expression.

In Workflow, a literals can be Numeric, String, or Boolean.

String Literals

String literals consists of zero or more characters surrounded by quotation marks. If a string contains quotation marks, these must be escaped in order for the expression to parse.

Escape Sequence: \" Resolves to a quotation mark.; \\ Resolves to a backslash. Any other character following the \ results in an unrecognized escaped character error.

Important: Projects created in a version earlier than v1.2 that use \ in a string literal in an expression must be changed to \\.

Numeric Literals

Numeric literals represent numbers, including positive and negative integers (for example, 1024) and decimal numbers (for example, 1.9867543).

These literals can also be defined by using scientific notation:

[-] m. dddddd E+ xx
[-] m. dddddd E- xx
[-] m. dddddd e+ xx
[-] m. dddddd e- xx

One or more nonzero digits (m) precede the decimal separator ("."). A minus sign ("-") can precede m. The Type performing the conversion determines the number of decimal places (dddddd) in the string, and maximum and minimum values for xx and m. The exponent (+ / - xx) consists of either a plus or minus sign followed by at least one digit.

Boolean Literals

Boolean literals represent logical value, and can be either True or False. The expression language is not case-sensitive and any combination of upper- and lowercase letters are valid.