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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.
With the help of an example display how records can be deleted and updated in QBE. (i) Increase Pay_Rate of employees along with the skill of ‘cook' by 10%. (ii) Delete employee
It can be easily defined as: The database must not have any unmatched foreign key values. The term "unmatched foreign key value" means a foreign key value for which there doe
Write short notes on tuple relational calculus. The tuple relational calculation is anon procedural query language. It defines the desired information without giving a particul
Increased overheads on update : On the drawbacks side, it will need the system to ensure that all replicas of a relation are consistent. This shows that all the replicas of the rel
Hierarchical
Define the term- Actors and Data Stores Actors: An actor is the active object which drives data flow graph by producing or consuming values. Actors are attached to inputs a
what do you understand by enhanced entity-relationship
Define a job scheduling strategy that will meet business requirement of reporting availability by 6am CST for the following cubes? Show the job scheduling dependencies in a pictori
Design Documentation The Design Document shall be an extension of Requirements Analysis Design. "The Design Document will comprise a revised and much more detailed descrip
Cardinality of Relationship One-to-One Only one entity of the first set is linked to only one entity of the second set. E.g. A teacher teaches a student. Only one teacher
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