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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
Write a query to determine the cost of the least expensive part in the part table? Format the returned price in dollars and cents using the correct function.
Examine different sales transactions. Design a context diagram and a level-0 diagram that represent the selling system at the store.
Write a Assignment to study and modify the PostgreSQL source code, with a focus on one of the core modules - the buffer manager
You are interested in analyzing some hard-to-obtain data from two separate databases. Each database contains n numerical values.
Transform the tables into one or more tables in BCNF. State the primary keys, candidate keys, and referential integrity constraints.
A small business with 100 computer workstations is installing a new local area network. All of the users perform the usual operations of e-mail. State your reasoning. Draw a floor plan for each If possible, show both floor plans on one page.
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.
Can Oracle have multiple group functions in the same SELECT list of query (i.e can we do a COUNT and AVG)? Let us assume we wanted to find lowest, highest, average.
In talking about database security, some aspects to regard as are Data Integrity, Confidentiality, and Malicious Activity. Illustrate how does database security relate to data integrity?
Prepare the relational schema for database
The library System stores 3 type of informations: Users ( USID, USNAME, USMob, USEmail, USDept,USStartDate, NofBooks). Create the library database schema Structure.
From information system point of view, we should take the key functions of organization and map them to strategic information. Do your companies follow this process or are steps skipped?
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