It is possible to have a schema and a decomposition that were not produced by the process, are in BCNF, and are not lossless despite the BCNF method's assurance of lossless decomposition. Describe how a schema like this is broken down and provide an example.

Consider a fashion database used to store the information of designers, each designer is identified by name, nationality, style, and his workshop address, and they designs dresses, each dress has color, fabric type, model, and category. The designs have price and code. Construct E.R diagram that models the designers and other entities and also the relationships between them.

Decomposition: what exactly is that? Coupling? Cohesion?

The following Figure 2 shows an EER schema for a database that can be used to track sales at a car dealership. Map this schema into a relational data model, including all primary keys and referential integrity constraints (foreign keys). For the VEHICLE to CAR/TRUCK/SUV generalization, consider the four Step 8 options presented in the lecture notes for mapping specializations/generalizations. Show the relational schema design under each of those four options (8A, 8B, 8C, 8D). Model Vin Sid VEHICLE N Price SALE Date 1 SALESPERSON Name 1 CAR Ssn TRUCK Tonnage SUV CUSTOMER Engine_size Name No_seats Address State Figure 2: An EER diagram for a car dealership database. City Street