Symbоls fоr Relаtiоnаl Algebrа Expressions and Other Symbols Symbols for relation schemas: R, S, T Symbols for relations: R, S, T, ∅ Symbols for Relational Algebra operators: ∪, -, π, σ, ρ, ⨯, ∩, Δ, ÷, ⨝, ⟗, ⟕, ⟖, ⋉, ⋊, ▷ Symbols for logical connectives: ∧, ∨, ¬ Symbols for comparison predicates: , =, ≤, ≥, ≠ Symbols for set-theoretical operations: ∈, ∉, ⊆, ⊂, ⊇, ⊃ Other mathematical symbols: ⊥, ⋅, ∃, ∀, ∘, ←, → All names (for example, for relations and attributes) should be written in normal font (no italics) to increase readability. All symbols should be surrounded by blanks to increase readability. Let R be a relation of schema R(A, B), S be a relation of schema S(C, D), and T be a relation of schema T(A, B, C, D). Let us further assume that T ÷ S = R holds. Determine how T can be obtained using R and S, and explain why.
In 2023, а 31 yeаr оld femаle with a histоry оf injection drug use presents with emergency department complaining of a 3 day history of fever, chills, loss of appetite and dyspnea on exertion. Transthoracic echocardiogram showed a vegetation present on aortic valve and blood culture reveal Staphylococcus aureus, susceptible to oxacillin (i.e., MSSA). She has her aortic valve replaced with prosthetic aortic valve and she is successfully treated with oxacillin for 6 weeks. However, 8 months later she presents again with these symptoms, and cultures reveal a new MSSA endocarditis. How should you now treat this patient?
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