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Consider to relational instances r ( R ) and s ( S ) of the schemas R and S respectively, where R and S have
Consider to relational instances and of the schemas and respectively, where and have the same arity and have compatible domains.
a
Write the logically equivalent statement for using only fundamentalcore relational algebra operations marks but you must use a different relational algebra expression than the one given in lecture: Hint: explair your solution using a Venn diagram.
b
Explain in clear English the logic behind your relational algebra expression, that is what is each major "chunk" of relational algebra doing, as well as how they are combined marks Hint: use Venn diagrams.
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