Lookup links cause Insight to look for matches between source and target fields in order to update the appropriate records. A lookup Link is required for all update, delete, and variable operations.
Lookup link matches can be either exact matches (the default) or "fuzzy" matches based on scalar functions. Examples of scalar functions are SOUNDEX, which can be applied to linked Lookup fields to find values that sound similar and LEFT, where the comparison is based on the first 'x' number of characters rather than an exact match of the entire field.
The Lookup Link functionality allows you to: