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Draw an ER diagram that shows the organization of a simple student database. The database captures the information about letter grades obtained by university students who enrolled in some sections of courses taught by some professors. In the database, each student is represented by a student ID and student name. Each course is represented by a course ID, a course name, and the number of credits assigned to the course; each section of a course is represented by a section ID (e.g., section "A01" of the 3-credit course "COMP 3380" named "Database concepts and usage").
Each professor is represented by the ID, name, office number and email address of the professor. Here, we assume that
(a) a student cannot repeat any courses,
(b) a student may take different sections of a course (e.g., COMP 4060 A03 and A08), and
(c) each course section is taught by one professor. Hint: Make sure you clearly identify the primary key of each entity set, the mapping cardinality of each relationship set, and also explicitly state the primary key of each relationship set.
Define union compatibility? Explain why INTERSECTION of two relations cannot be performed if they are not union compatible? Two relations R(A1, A2,-------, An) and S(B1, B2,--
Show, with the help of an example, that relatively high-level transitions result when system or program is stimulated by the outside events. In diagram below, we can observe i
Identify the need and use of data control through problem solving, illustration
Express types of information available in MySQL? Information as regards the result of queries: This includes number of records affected by any SELECT or UPDATE or DELETE st
What is Trigger? Trigger: A database trigger is procedural code which is automatically executed in response to specific events on a particular table in a database. Triggers can
Explain the θ-join and equijoin Refer tables Car and Boat which list models of cars and boats and their relevant prices. Assume a customer wants to buy a car and a boat, but sh
What are the situations while DBMS should not be used? DBMS should not be used in situations like: (i) No need of security. (ii) Not difficulty to access the data (iii) N
Primary Key The primary key is the candidate key that is selected by the database designer as the principal denotes of identifying entities within an entity set. The left candi
What are the two main goals of parallelism? Load -balance multiple small accesses, so that the throughput of such accesses enhances. Parallelize large accesses so that the res
Define what Immediate database modification technique uses? Ans: Both undo and redo.
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