Entity relationship model
For each of the projects, do the following:
a. Draw an ER diagram. Make sure each entity type has at least one key attribute. Document any assumptions you make. Avoid diagrams with a single entity.
b. For each attribute, determine its domain of values, whether null is an acceptable value, and, if acceptable, what null indicates.
c. If you think the description is incomplete, list other data the database should store.
d. Adjust your design to incorporate these additions.
1. A chemistry department wants to have a database of all chemicals in the stockroom. The information includes the name, molecular formula, amount on hand, date purchased, supplier, and supplier contact information.
2. A space agency wants to develop a database of all satellites that humans have launched into space. Data includes the satellite identification, date of launch, destruction date, purpose, maximum orbital altitude, launching location, launching agency, and contact information for agency.
3. An environmental agency wants to catalogue all the plants in an area that is susceptible to acid rain. Data should include genus, species, quantity, date, quadrant identification number, quadrant location, average altitude of quadrant, and botanist.
4. A psychological study requires participants to answer a number of questions related to personality. The database should store the multiple choice answers (A, B, C, D) to the questions and information about each participant, such as participant id, age, and sex. The database should compute a score based on the individual's answers. The score indicates one of 8 personality categories. Each category has an identifying name and specifies that each of three qualities is either true or false.
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