Create a Crow's Foot ERD to include the following business rules for the ProdCo company:a. Each sales representative writes many invoices.b. invoice is written by one sales representative.c. Each sales representative is assigned to one department.d. Each department has many sales representative.e. Each customer can generate many invoicesd. Each invoice is generated by one customer

For the table BOOKAUTHOR below you are given the following functional dependencies. BOOKAUTHOR (ISBN, BookTitle, Author_Num, LastName, Publisher, Royalty, Edition) Functional dependencies: 1. ISBN BookTitle, Publisher, Edition 2. Author Num → LastName 3. BookTitle → Publisher 4. {ISBN, Author_Num} → BookTitle, LastName, Publisher, Royalty, Edition Write the types of functional dependencies shown in (1) to (4) above. Also, decompose the table to the third normal from (3NF).

2. Use the definition of the join operator and properties of operators o, II, U, p, -, x, prove the formula for the join selectivity. |R DA CS| Join Selectivity |R| * IS

Q2: Draw an ERD from the following business rules: Use proper notations for the type of attributes A software system is to be developed for an educational institute.The software is intended to be used by faculty members, students and designated support staff. System administrator will also use system for system administration and management. Student’sdata including names, registration number, cell numbers and address will be added and edited by Clerk. The data will be added at the timeof student reporting at campus. Student can enroll into any course of their choice from the offered courses. They can also request for dropping a course. Approval of course dropping of a student will be granted or refused by academic coordinators