Data Dependency

Query:

Which pilots work for the same airline as Mike?

Query plan (not maximal):

q(Pilot) <=> ws(Date1,From1,To1,mike,Aircraft1) &

ws(Date2,From2,To2,Pilot2,Aircraft1) &

ws(Date3,From3,To3,Pilot2,Aircraft2) &

ws(Date4,From4,To4,Pilot,Aircraft2)

Depending on the data in the sources,

query plans with 1, 2, 4, 6, 8, … subgoals are

needed to extract all available information

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