TAILIEUCHUNG - Giáo trình SQL Bài 9

Tham khảo tài liệu 'giáo trình sql bài 9', công nghệ thông tin, kỹ thuật lập trình phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 1 2 Exercises Consider the following set of requirements for a university database that is used to keep track of students transcripts. This is similar but not identical to the database shown in Figure a The university keeps track of each student s name student number social security number current address and phone permanent address and phone birthdate sex class freshman sophomore . graduate major department minor department if any and degree program . . . . . Some user applications need to refer to the city state and zip of the student s permanent address and to the student s last name. Both social security number and student number have unique values for each student. b Each department is described by a name department code office number office phone and college. Both name and code have unique values for each department. c Each course has a course name description course number number of semester hours level and offering department. The value of course number is unique for each course. d Each section has an instructor semester year course and section number. The section number distinguishes different sections of the same course that are taught during the same semester year its values are 1 2 3 . up to the number of sections taught during each semester. e A grade report has a student section letter grade and numeric grade 0 1 2 3 4 for F D C B A respectively . Design an ER schema for this application and draw an ER diagram for that schema. Specify key attributes of each entity type and structural constraints on each relationship type. Note any unspecified requirements and make appropriate assumptions to make the specification complete. 2 2 Consider the ER diagram of Figure which shows a simplified schema for an airline reservations system. Extract from the ER diagram the requirements and constraints that resulted in this schema. Try to be as precise as possible in your requirements and constraints .

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