q answer the following parts using database knowledge a if a functional dependency x 5153780

Q# Answer the following parts using database knowledge:

(a) If a functional dependency X→Y holds in two relations R and S, does the functional dependency X→Y still hold on the relation R NJ S (where NJ stands for “natural join”)? Justify your answers.

(b) Will you agree that all the relationships involving a weak entity set should connect to that weak entity set using double line? If you do/don’t agree, please explain briefly in either case.

(c) What is the consequence of inserting rows into a “view” V when: (i) V is defined based on one physical table (ii) V is defined based on multiple tables

(d) Compare and contrast the three types of single-level indices, i.e., primary index, clustering index, and secondary index, in terms of their (i) applicable conditions (ii) the kinds of supportable search/queries.

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