Task $1$

Given the following problem description, draw an ER diagram that identifies all entities, attributes, primary keys, cardinality and degree of relationships. $(10$ marks. Entities correctly identified: $3$ marks. Attributes correctly identified: $3$ marks. Relationships and cardinality: $3$ marks. Primary keys: $1$ mark$)$

A shipping company ABC Courier offers the most efficient package delivery service by ensuring it can track the location and processing of every single package. They use a database system to store this information. In order to ship a package, customers drop off the package at a store location. The store must receive the packages and enter them into the system. The store can be described by store number, and location. The shipped packages are described by package number, delivery address, weight, dimensions, and delivery date. Once the packages have been entered, they will be transported to the delivery address, this can be through ground or air or a combination of both. To keep track of the packages during transportation, each transportation event is given a type $($ground or air$),$ route number and schedule number.

Task $2$

Given the following problem description, draw an ER diagram that identifies all entities, attributes, primary keys, cardinality and degree of relationships. $(10$ marks. Entities correctly identified: $3$ marks. Attributes correctly identified: $3$ marks. Relationships and cardinality: $3$ marks. Primary keys: $1$ mark$)$

A book is identified by its ISBN number, and it has a title, a price, and a date of publication. It is published by a publisher, which has its own ID number and a name. Each book has exactly one publisher, but one publisher typically publishes multiple books over time.

A book is written by one or multiple authors. Each author is identified by an author number and has a name and date of birth. Each author has either one or multiple books; in addition, occasionally data are needed regarding prospective authors who have not yet published any books.

Task $3$

Given the following problem description, draw an ER diagram that identifies all entities, attributes, primary keys, cardinality and degree of relationships. $(10$ marks. Entities correctly identified: $3$ marks. Attributes correctly identified: $3$ marks. Relationships and cardinality: $3$ marks. Primary keys: $1$ mark$)$

A piano manufacturer wants to keep track of all the pianos it makes individually. Each piano has an identifying serial number and a manufacturing completion date. Each instrument represents exactly one piano model, all of which have an identification number and a name. In addition, the company wants to maintain information about the designer of the model. Over time, the company often manufactures thousands of pianos of a certain model, and the model design is specified before any single piano exists.

A piano manufacturer employs piano technicians who are responsible for inspecting the instruments before they are shipped to the customers. Each piano is inspected by at least two technicians $($identified by their employee number$).$ For each separate inspection, the company needs to record its date and a quality evaluation grade.

The piano technicians have a hierarchy of reporting relationships: Some of them have supervisory responsibilities in addition to their inspection role and have multiple other technicians report to them. The supervisors themselves report to the chief technician of the company.

Submission

Export the ER diagrams as a PNG and upload the lab to Brightspace. Any ER modelling software may be used to create the diagrams including MySQL Workbench and Visio.