Maintaining Referential Integrity Constraints for Only Specific Rows by Using Materialized Views

(Yuli Vasiliev) Typically, materialized views are used to improve query performance or provide replicated data. However, you may use them to maintain referential integrity constraints on tables for only specific rows. In the following example, we define a referential integrity constraint only for those rows in the account_details table that are associated with the accounts stored in the accounts table that expire in 2004 or later. To achieve this functionality, we, in fact, define a foreign key on a materialized view that queries only the necessary rows from the account_details table.