Solution to Two Open Problems

Two open query planning problems can be solved using

recursive query plans:

Functional dependencies in domain model

1

2

Limitations on binding patterns of sources

address_server ($Name,Address,Phone)

Name must be provided to query for Address and Phone

White_pages(Name,Address,Phone)

Phone Address

Every phone number corresponds to a single address.

6.1 [Duschka & Levy]

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