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Assume that a student table in a university database has an index on StudentID (the primary key). and additional indexes on Major, Age, Marital status, and HomeZipCode.
Further, assume that the university wanted a list of students majoring in computer science, over the age of 25, and Married.
How could indexes be used so that only records that satisfy the qualification are accessed?
What are the uses the above Index used?
Write an application that creates a database named PhoneBook. The database should have a table named Entries, with columns for a person's name and phone number. Next, write an application that lets the user add rows to the Entries table,
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.
What about giving same name to attributes which are in different tables but are not same? For instance, "Description" in both a Course table and a Classroom table.
Explain what is the purpose of Database? The purpose of a database is to store information about certain types of objects. Give an example of two related TABLES.
Compute a canonical cover for the above set of functional dependencies (show each step of your derivation with an explanation).
What actions does a referential integrity constraint prevent from occurring when data is inserted in a table that contains this constraint?
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. Find the names of all students who have GPA greater than 3.
Create tables in 3NF. As you create the database, include different codes for at least three of the fields. Use sample data to populate fields for at least three records in each table.
The DBA denormalized some of the data in the Premiere Products database to improve performance. Which field or fields cause the table to no longer be in third normal form? In which normal form is the denormalized table?
Create a 2-3 page (350 words per page) examining the use of databases in organization. Explain what database applications are utilized (Microsoft Access, DB2, Oracle, etc.).
Relational database is based on fact that data in one table can be tied, or related to data in another table. To do this, database utilizes various types of keys to form or define these relationships.
You have a file which contains credit card records. Each record contains field for the card number, expiration date, and name of card holder. Explain what primary problem you try to solve is.
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