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fe34b7f567
relational
/
tests_dir
/
union_join.query
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New query optimization A * B ∪ A * C = A * (B ∪ C)
2015-12-31 07:26:28 +07:00
people⋈
σ
skill == 'Perl' (skills)
∪
(people⋈
σ
skill == 'C' (skills))