Consider a view branch-cust defined as follows: create view branch-cust as select branch-name, customer-name from depositor, account
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Consider a view branch-cust defined as follows: create view branch-cust as select branch-name, customer-name from depositor, account where depositor.account-number = account.account-number Suppose that the view is materialized, that is, the view is computed and stored. Write active rules to maintain the view, that is, to keep it up to date on insertions to and deletions from depositor or account. Do not bother about updates.
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