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SSIS Integration Services Expression Reference
Official link to the Integration Services Expression Reference on MSDN.
Expressions are a combination of symbols (identifiers, literals, functions, and operators) that yields a single data value. Simple expressions can be a single constant, variable, or function. More frequently, expressions are complex, using multiple operators and functions, and referencing multiple columns and variables.
Links on the MSDN reference site.
Integration Services Expression Concepts: Describes expression evaluator syntax, the data types that the Data Transformation Pipeline uses, data type conversion, and expression elements.
Operators (SSIS Expression): Describes the operators that the expression evaluator provides.
String Functions and Other Functions (SSIS Expression): Describes the functions that the expression evaluator provides.
Advanced Integration Services Expressions: Provides expressions that use multiple operators and functions.
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