What are the requirements that two relations must satisfy in order to be considered union compatiblity?why ar those requirements necessary ?

Question 1: Normalization   Consider a relation X with six attributes WYSMFE where WS is a composite primary key for X. Assume X has the following functional dependencies (X is one table with the attributes W, Y, S, M, F, E): WS è YMFE S è YME E è M   In what normal form is relation X? Explain why?   Is it possible to decompose X into a number of relations in order to achieve a higher normal form? Explain how (this means using English sentences and a diagram showing the final relation(s)).   officeNo officeAddress telNo mgrStaffNo name B001 8 Jefferson Way, Portland, ME 97201 503-555-3618 S1500 Tom Daniels B002 City Center Plaza, Seattle, WA 98122 206-555-6756 S0010 Mary Martinez B003 14 – 8th Avenue, New York, NY 10012 212-371-3000 S0145 Art Peters B004 16 – 14th Avenue, Seattle, WA 98128 206-555-3131 S2250 Sally Stern   Primary key: officeNo   Why the above table is not in 3NF? Describe and illustrate the process of…

Draw the Enhanced Entity–Relationship (EER) model and the relational schema for the case study below: This case study describes a company called HomeCinema, which rents out videos to its members. The first branch of HomeCinema was established in 1982 in Jeddah but the company has now grown and has many branches throughout the country. As HomeCinema has grown, so has the difficulties in managing the increasing amount of data used and generated by the company. To ensure the continued success of the company, the Director of HomeCinema has urgently requested that a database application be built to help solve the increasing problems of data management. The data held on a branch of HomeCinema is the branch address made up of street, city, state, and zip code, and the telephone numbers (maximum of 3 lines). Each branch is given a branch number, which is unique throughout the company. Each branch of HomeCinema has staff, which includes a Manager, one or more Supervisors, and a number of other…

What does the term "relationship" mean? What are the qualities of a relation defined as?

Question 26 In a one-to-many binary relationship, the one-to-many refers to which of the following? Group of answer choices the minimum cardinalities of the entities involved the maximum cardinalities of the entities involved the degree of the relationship the maximum cardinality of one entity involved and the the minimum cardinality of the other entity involved

Explain three situations under which a surrogate key for the main key of a relation should be established.