Chapter 4 Section 7 Exercises page 180. Solve exercise 4.3 (a, b, c, d). 4.3 Suppose that a data warehouse consists of the three dimensions time, doctor, and patient, and the two measures count and charge, where charge is the fee that a doctor charges a patient for a visit. (a) Enumerate three classes of schemas that are popularly used for modeling data warehouses. (b) Draw a schema diagram for the above data warehouse using one of the schema classes listed in (a). (c) Starting with the base cuboid [day, doctor, patient], what specific OLAP operations should be performed in order to list the total fee collected by each doctor in 2010? Use RStudio HyperCube to build a base cuboid solution [day, doctor, patient]. Create data. Extract information, to list the total fee collected by each doctor in 2010. (d) To obtain the same list, write an SQL query assuming the data are stored in a relational database with the schema fee (day, month, year, doctor, hospital, patient, count, charge). Use phpMyAdmin to create a database called db_doctor_billing, and associated tables to support your design. Create data. Write and excute your SQL statement. Chapter 4 Section 7 Exercises page 180. Solve exercise 4.3 (a, b, c, d). 4.3 Suppose that a data warehouse consists of the three dimensions time, doctor, and patient, and the two measures count and charge, where charge is the fee that a doctor charges a patient for a visit. (a) Enumerate three classes of schemas that are popularly used for modeling data warehouses. (b) Draw a schema diagram for the above data warehouse using one of the schema classes listed in (a). (c) Starting with the base cuboid [day, doctor, patient], what specific OLAP operations should be performed in order to list the total fee collected by each doctor in 2010? Use RStudio HyperCube to build a base cuboid solution [day, doctor, patient]. Create data. Extract information, to list the total fee collected by each doctor in 2010. (d) To obtain the same list, write an SQL query assuming the data are stored in a relational database with the schema fee (day, month, year, doctor, hospital, patient, count, charge). Use phpMyAdmin to create a database called db_doctor_billing, and associated tables to support your design. Create data. Write and excute your SQL statement