What do you understand by the term cardinality?
Answer to relevant QuestionsWrite tuple selector invocations for a typical tuple from each of the relvars in the suppliers-parts-projects database.It is sometimes suggested that a relvar is really just a traditional computer file, with “tuples” instead of records and “attributes” instead of fields. Discuss.Given the usual suppliers-and-parts database, what is the value of the expression S join Sp join P? What is the corresponding predicate? Warning; there is a trap here.Let r be the relation denoted by the following expression; SP group () as x Show what r looks like, given our usual sample value for SP. Also, show the result of; r ungroup xGet part number of parts supplied to some project in an average quantity of more than 350.
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