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When you need to update data from one table to another, consider the following rule: the data types for the source and destination fields must either match or be compatible.Furthermore, when you update data from one table to another and use compatible data types instead of matching data types, Access converts the data types of those fields in the destination table.Such policies call functions that you design to specify dynamic predicates that establish the restrictions.You can also group established policies by applying a policy group to a particular application.As a result, some of the data in the destination fields may be truncated (deleted).

This level of control, which enables you to use application context with fine-grained access control, is called Virtual Private Database (VPD).

Thankfully, record removal doesn’t have to be a long and tedious process; you can find these discrepancies in seconds using the Find Duplicates Query wizard.

To show how this technique works, we will use the Find Duplicates Query wizard to determine which customers in the Customers table, shown in Figure A, have the same address assigned to their Street Address fields.

Clicking Next brings up the screen shown in Figure E, where we select the fields to be displayed along with the Street Address field in the query results.

The results shown in Figure G indicate that two different customers have been assigned the same street address, while two other customers have each been assigned two different customer IDs.