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Suppose that the bank used in the textbook s running example maintains a statisti - cal database containing the average balances of all customers. The
Suppose that the bank used in the textbooks running example maintains a statisti cal database containing the average balances of all customers. The scheme for this relation is customername, customercity, avgbalance Assume that for security reasons, the following restrictions are imposed on queries against this data: Every query must involve at least customers The intersection of any pair of queries must be at most Construct a series of queries to find the average balance of a customer. Hint: this can be done in fewer than queries.
Suppose that the bank used in the textbooks running example maintains a statisti cal database containing the average balances of all customers. The scheme for this relation is customername, customercity, avgbalance Assume that for security reasons, the following restrictions are imposed on queries against this data:
Every query must involve at least customers
The intersection of any pair of queries must be at most
Construct a series of queries to find the average balance of a customer. Hint: this can be done in fewer than queries.
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