SQL allows relations with duplicates. a. Define versions of the basic relational-algebra operations , , , ,
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SQL allows relations with duplicates.
a. Define versions of the basic relational-algebra operations σ, Π, ×, Π, −, ∪, and ∩ that work on relationswith duplicates, in a way consistent with SQL.
b. Check which of the equivalence rules 1 through 7.b hold for the multiset version of the relational-algebra defined in part a.
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a We define the multiset versions of the relationalalgebra operators here Given multiset relations r ...View the full answer
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