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1: Consider the following relational database: STUDENT (SID, SName, GPA ) ENROLL (SID, CNo, Date ) COURSE (CNo, CTitle, Credits) REQUIRE (CNo, Prerequisite) Based on this relational database; give an expression in the relational algebra to express each of the following queries:
a. Find the names of all students who have GPA greater than 3. b. Find the ID of all students who did not enroll in course IT222. c. Find the name of all students who enroll in both IT222 and IT221 courses. d. Find the names and GPAs of all students who enrolled in Course IT222. e. List the students ID, name, GPA, and course Number such that all students have GPA greater than 3 . 5 and enrolled in a course in Jan 1, 2011. f. List all students' names with the title of courses they registered in. g. List the details of all students and their course enrollment; along with the courses prerequisites if they have one. h. Find the details of all students who enrolled in all courses
Compare the two non-sequential file structure models. What advantages does the first one have over the second and what advantages does the second have over the first?
Using your knowledge of the college environment, determine the functional dependencies that exist in the following?
To lock any other vertex, the transaction must have visited all the parents of that vertex and must be having a lock on one of the parents of the vertex. Show that the protocol ensures serializability and deadlock freedom.
List the names of agents that placed an order for customer C003 or customer C006. List all pair of products names that are in the same city, along with their city name.
Design a Database schema
Use the results of the transcripts of an interview with IT consultant. Prepare a Fully Attributed Data Model. Add the data attributes for each entity."
Design a work breakdown structure for the task below: Designing the database, Working on the website content
What is the order P of the B+-tree if B+-tree access structure on the key is constructed? What is the number of leaf-level blocks needed if blocks are approximately 69% full (round up for convenience)?
Write down the SQL code in order to carrying out the following requests. Display all the data in each of the four tables. Do not display the foreign key columns.
How many entities are shown by this relation?
Describe the entity-relationship model. How are entities, relationships, and attributes represented in this model? What is a composite entity? Describe the approach to diagrams that uses a crow's foot.
In 500 words or less, trace the history of the development of databases beginning with pre-computer days to the present.
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