The Merge Join Transformation in SSIS enables you to perform an inner or outer join operation in a streaming fashion within the SSIS Data Flow. The Merge Join Transformation does not preload data like the Lookup Transformation does in its cached mode. Nor does it perform per-record database queries like the Lookup Transformation does in its noncached mode. Instead, the Merge Join Transformation accepts two inputs, which must be sorted, and produces a single output, which contains the selected columns from both inputs, and uses the join criteria defined by the package developer.
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