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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.
One-way Associations If an association is only traversed in single direction, then it is known as one-way association. It is implemented as a pointer or an attribute which con
Explain the Deferred Update The deferred update methods do not physically update the database on disk till after a transaction reaches its commit point; after that the updates
1) 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 pict
Saving Derived Attributes to Avoid Re-computation As discussed, "redundancy means duplication of exact data". But, if multiple copies of same data are present in the system,
what is 3nf
The Maximum no of key fields that can be used in a header is?? 50
How does a query tree represent a relational algebra expression? Ans: This includes transforming an initial expression (tree) into an equivalent expression (tree) that is
Dirty Reads: T10 reads a value which is updated by T9. This update has not been committed and T9 aborts. T9 T10 Value of x old value = 200
Define data conversion? Helpful to load data into temporary staging tables. Then can write SQL code to do much of data processing. SQL code is simpler and faster to write than
Given the subsequent relations: vehicle (reg_no, make, colour) Person (eno, name, address) Owner (eno, reg_no) Write expressions
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