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.
Answer to relevant QuestionsIn ordinary arithmetic, multiplication and division are inverse operation. Are times and divide by inverse operations in the relation algebra?Get all supplier-number/part-number/project-number triples such that the indicated supplier, part, and project are not all collocated.Get the total number of part P1 supplied by supplier S1Get part numbers for parts that are supplied either by a London supplier or to a London project.Give an efficient algorithm to find the length (number of edges) of a minimum-length negative-weight cycle in a graph.
Post your question