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Lookup transformation is Passive and it can be both Connected and UnConnected as well. It is used to look up data in a relational table, view, or synonym. Lookup definition can be imported either from source or from target tables.

For example, if we want to retrieve all the sales of a product with an ID 10 and assume that the sales data resides in another table. Here instead of using the sales table as one more source, use Lookup transformation to lookup the data for the product, with ID 10 in sales table.


Connected lookup receives input values directly from mapping pipeline whereas

UnConnected lookup receives values from: LKP expression from another transformation.


Connected lookup returns multiple columns from the same row whereas

UnConnected lookup has one return port and returns one column from each row.


Connected lookup supports user-defined default values whereas

UnConnected lookup does not support user defined values.

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