2. Design an ER diagram for an IT training group database that will meet the information need’training programme. Clearly indicate the entities, relationships and the key constraints. The description of the environment is as follows:
The company has 12 instructors and can handle up to 100 trainees for each training session. The company offers 5 Advanced technology courses, each of which is taught by a team of 2 or more instructors Each instructor is assigned to a maximum of two teaching teams or may be assigned to do research Each trainee undertakes one Advanced technology course per training session.
3. An organization has multiple retail stores. These stores have to keep track of products, suppliers, customers and employees. They also make discount offers on several items during festivals. Make an ER_diagram stating assumptions used, if any. Use concept of keys, aggregation, generalization, cardinality etc. in a proper way.
Perform the following queries in SQL based on your ER-diagram:
? Find the details of products which have got more than discount.
? Find the details of stores which have maximum sales monthly.
? Find details of employee who have been working with retail stores more than 15 years.