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0. Consider the relations r(A, B) and s(B, C), where s.B is a primary key and r.B is a foreign key referencing s.B. Consider the query Q: r⋈(σB<5(s)) Let LOJ denote the natural left outer-join operation. Assume that r and s contain no null values.
σB<5(r ⋈ s)
σB<5(r LOJ s)
r LOJ (σB<5(s))
σB<5(r)LOJ s
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