$1$ Why is it important to choose an entity type with total participation for the role of $\backslash ($ S $\backslash )$ when mapping a $1$:$1$ relationship type?

$2$ How does a category differ from a regular shared subclass? What is a category used for? Illustrate your answer with examples.

$3$ The following narrative describes a simplified version of the organization of Olympic facilities planned for the summer Olympics. Draw an EER diagram that shows the entity types, attributes, relationships, and specializations for this application. State any assumptions you make.

The Olympic facilities are divided into sports complexes. Sports complexes are divided into one$-$sport and multisport types. Multisport complexes have areas of the complex designated for each sport with a location indicator $($e$.$g$.,$ center, NE corner, and so on$).$ A complex has a location, chief organizing individual, total occupied area, and so on$.$ Each complex holds a series of events $($e$.$g$.,$ the track stadium may hold many different races$).$ For each event there is a planned date, duration, number of participants, number of officials, and so on$.$ A roster of all officials will be maintained together with the list of events each official will be involved in$.$ Different equipment is needed for the events $($e$.$g$.,$ goal posts, poles, parallel bars$)$ as well as for maintenance. The two types of facilities $($one$-$sport and multisport$)$ will have different types of information. For each type, the number of facilities needed is kept, together with an approximate budget.

$4$ For the provided ER diagram, discuss all three methods for mapping a $1$:$1$ relationship type to a relational schema. $5$ Map the BANK ER schema shown in the figure below into a relational schema. Specify all primarv kevs and foreign kevs.

$6$ Consider the EER diagram in the figure below for a car dealer. Map the EER schema into a set of relations. For the VEHICLE to CAR$/$TRUCK$/$SUV generalization, consider the $8$A$,8$B$,8$C and $8$D option show the relational schema design under each of those