For more information, see Integration Services Data Types. Exact matching can use any DTS data type except DT_TEXT, DT_NTEXT, and DT_IMAGE. Only input columns with the DT_WSTR and DT_STR data types can be used in fuzzy matching. This transformation has one input and one output. If you want to use only exact matching, use the Lookup transformation instead. However, the transformation requires at least one column match to be configured for fuzzy matching. The match between the value in an input column and the value in the reference table can be an exact match or a fuzzy match.

The reference data source must be a table in a SQL Server database. The transformation needs access to a reference data source that contains the values that are used to clean and extend the input data. If it fails, the Fuzzy Lookup transformation provides close matches from the reference table. First, the Lookup transformation tries to find an exact match.

In contrast, the Fuzzy Lookup transformation uses fuzzy matching to return one or more close matches in the reference table.Ī Fuzzy Lookup transformation frequently follows a Lookup transformation in a package data flow. It returns records with at least one matching record, and returns records with no matching records. The Lookup transformation uses an equi-join to locate matching records in the reference table.

The Fuzzy Lookup transformation differs from the Lookup transformation in its use of fuzzy matching. For more detailed information about the Fuzzy Lookup transformation, including performance and memory limitations, see the white paper, Fuzzy Lookup and Fuzzy Grouping in SQL Server Integration Services 2005.

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