Draw an ER diagram

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. Students(stulD, lastName, firstName, major, credits) Faculty (facID, name, deptName, rank) • Classes(classNumber, facID, schedule, room) • Enrolls(stulD, classNumber, grade) The primary keys are underlined. The referential integrity constraints are as follows: . the column facID of relation Classes that references table Faculty, . the column stulD of relation Enrolls that references table Students, and the column classNumber of relation Enrolls that references table Classes. The following query is intended to retrieve the number of all classes taught by John Smith in the CST department. However, this query does not work properly. There are at least two faculty members who share the name, John Smith. Briefly explain and show the corrected SQL query_ why. SELECT classNumber FROM Classes WHERE facID= (SELECT facID FROM Faculty WHERE name='John Smith' AND deptName='CST');

Consider the following database instance. Table name: Students  Primary key: sid Sid sname 7 Ricky 2 Ellen 6 MaryLou 4 Ellen   Table name: Courses  Primary key: cid cid cname 1 ICS 2 Finance   Table name: Register Primary key: sid,cid Foreign key: sid references Students(sid) Foreign key: cid references Courses(cid) sid cid 7 2 2 2 7 1 4 1   5.1) For each of the following statements, show whether the statement is correctly executed or not (assume that the statements are executed in order, which means that if a statement is correctly executed, its effect is reflected in the following statement). If you say the statement is not executed, explain why. INSERT INTO Students VALUES (3, ‘Ellen’);     INSERT INTO Students VALUES (6, ‘Ellen’);     INSERT INTO Register VALUES (1, 2);     INSERT INTO Courses VALUES (5, ‘Systems’);     INSERT INTO Register VALUES (6, 5);     INSERT INTO Register…

Consider the following database instance. Table name: Students  Primary key: sid Sid sname 7 Ricky 2 Ellen 6 MaryLou 4 Ellen   Table name: Courses  Primary key: cid cid cname 1 ICS 2 Finance   Table name: Register Primary key: sid,cid Foreign key: sid references Students(sid) Foreign key: cid references Courses(cid) sid cid 7 2 2 2 7 1 4 1   5.1) For each of the following statements, show whether the statement is correctly executed or not (assume that the statements are executed in order, which means that if a statement is correctly executed, its effect is reflected in the following statement). If you say the statement is not executed, explain why. INSERT INTO Students VALUES (3, ‘Ellen’);     INSERT INTO Students VALUES (6, ‘Ellen’);     INSERT INTO Register VALUES (1, 2);     INSERT INTO Courses VALUES (5, ‘Systems’);     INSERT INTO Register VALUES (6, 5);     INSERT INTO Register…

A rental car company divides its cars into four categories: small, mid-size, full-size, and sport utility. The agency wishes to collect the following information from all vehicles: Vehicle, Make, Model, Year, and Color are all required. There are no distinguishing characteristics for any of the four vehicle classifications. Rents is a connection between the entity type vehicle and the entity type client. There is no one-to-one connection between any of the four vehicle types and any entity type. Would you think about making a supertype/subtype connection for this problem? If so, why or why not?

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it says relation room doesnt exist.

Based on the provided information below, what would be the entities and the relationship between each one? Thank you!

Create an ERD for a car dealership and also show entity names, primary keys, attributes for each entity, relationships between the entities and cardinality. The dealership sells both new and used cars, and it operates a service facility. Base your design on the following business rules: A salesperson may sell many cars, but each car is sold by only one salesperson. A customer may buy many cars, but each car is bought by only one customer. A salesperson writes a single invoice for each car he or she sells. A customer gets an invoice for each car he or she buys. A customer may come in just to have his or her car serviced; that is, a customer need not buy a car to be classified as a customer. When a customer takes one or more cars in for repair or service, one service ticket is written for each car. The car dealership maintains a service history for each of the cars serviced. The service  records are referenced by the car’s serial number. A car brought in for service can be worked on by…