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1. Suppose we are to design a registrar's database to store information about students, courses, the courses students have taken, and the grades students have gotten in these courses. Courses have a number, a department, and a title, for example, "CS101: Introduction to computing" has department = CS, number = 101, and title = "Introduction to Computing." Numbers are assigned by departments, and different departments may use the same number. Students are represented by their (unique) student ID and their name. "Enrollments" each consist of a course, a student who took that course, and the grade the student got in the course.
a. Draw an E/R diagram that represents this database structure correctly.
b Convert the E/R diagram of part a into a relational schema.
These following questions require to you to create entities and their relationship using the Crow's Foot notation suitably.
In 500 words or less, trace the history of the development of databases beginning with pre-computer days to the present.
At this point in the design process, you would have a detailed physical schema created for a database. How would you approach converting your schema into a database, complete with sample data? Explain your approach in two to three paragraphs.
Identify and explain the differences between a stack and a queue data structure
Several times, database triggers are utilized to record logins by users. Here is the example of login trigger that inserts row into table every time a user connects.
Express given five loosely described problems carefully in { Instance, Question } form as utilized in "Computers and Intractability". Determine that a list of n numbers has no duplicates.
Create a database using Oracle packaged procedure
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.
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.
You have probably seen that already when you tried to create an E-R diagram. Visio uses notation and graphical shapes that are not the same as those in your text. If you look at some of the links to schemas, you will see a similar sort of thing.
Create and run the following sql queries and submit the screen shot of your result. Also submit the file lab_06_03. sql
What are triggers used for, and why are they important in database systems? Provide an example of a situation where a trigger would be appropriate.
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