StudentAdvisorDBV1-ER Diagram Subjects PK SubjectTeachers SubjectID tinyint PK,FK1 SubjectID tinyint Title varchar(50) PK,FK2 TeacherID smallint PK,FK3 GroupID tinyint Teachers PK TeacherID smallint FirstName varchar(20) LastName varchar(20) Marks PK MarkID tinyint StudentID smallint SubjectID tinyint PostedDate Mark datetime varchar(10) Students PK StudentID smallint FirstName varchar(20) LastName varchar(20) GroupID tinyint Groups PK GroupID tinyint GroupName varchar(20)