What is a primary purpose of the Expression Transformation?

The primary purpose of the Expression Transformation is to perform calculations on data. This transformation is specifically designed to facilitate the manipulation and transformation of data within a mapping. By using the Expression Transformation, you can define expressions to calculate values, manipulate strings, perform mathematical operations, and derive new fields based on existing data.

The flexibility it provides for data manipulation allows users to create output fields that can utilize expressions involving numeric calculations, string concatenations, or conditional logic. This capability makes the Expression Transformation a vital component when individual transformations or calculations are required without altering the overall flow of data between sources and targets.

While other transformations have distinct functions—such as filtering data or aggregating rows—the Expression Transformation specifically focuses on computing and transforming data using expressions, making it essential for customizing data outputs in Informatica integrations.