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Lecture Notes in Computer Science
In a centralized setting, the declarative nature of SQL is a major strength: a user can simply describe what she wants to retrieve, and need not worry about how the resulting query plan is actually generated and executed. However, in a decentralized setting, two query plans that produce the same result might actually reveal vastly different information about the intensional description of a user's query to the servers participating its evaluation. In cases where a user considers portions of herdoi:10.1007/978-3-642-23822-2_34 fatcat:hd3jh5vhzvetvp4pk7und5lgj4