There are the following three options for each of the types of comparison which are briefly described below:

1. Matching within a file/table: Here, the program looks for duplicate addresses or records within a single file/table.

2. Matching between two files/tables: Here, one file/table is compared against another, for e.g. in the case of new customer recruitment, in order to delete existing customers from a promotions list, or alternatively, to take addresses from a black list in consideration during an advertising campaign. The two tables involved in the comparison can have different structures and/or different file formats.

3. Multiple comparisons: Here, several files/tables can be involved at one time in the comparison. It can be determined whether a certain table should be read-only and therefore only used for the comparison with other tables, and if there should be in this case a comparison within the table itself (internal matching). Furthermore, using the sequence of the tables, it can be determined in which of two tables the doublets should be deleted during the comparison. Doublets are always deleted in the table of lower priority. With universal matching, the multiple comparisons are not available.

The following types of comparison are available:

• All-in-One Comparison
• Matching Using the Postal Address
• Matching Using the Telephone Number
• Matching Using the Email Address
• Customer No. / Contact Person Matching
• Matching Using the Tax Number
• Matching Using a Date
• Universal matching