Give some examples of types for which it might be useful to define two or more distinct possible representations. Can you think of an example where distinct possible representations for the same type have different numbers of components?
Answer to relevant QuestionsGiven an appropriate set of scalar type definitions for the suppliers-parts-projects database do not attempt to write the relvar definitions. Write tuple selector invocations for a typical tuple from each of the relvars in the suppliers-parts-projects database.We have seen that data definition operations cause updates to be made to the catalog. But the catalog is only a collection of relvars, just like the rest of the database; so could we not use the regular update operations ...Of Cod’s original set of eight operators, union, difference, product, restrict, and project can be considered as primitives. Give definitions of natural join, intersect, and (harder) divide in terms of those primitives.Get all pairs of city names such that a supplier in the first city supplies a project in the second city.
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