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1. Discussion of database with the goal of creating Web database applications. There is something of a disconnect between modeling data in an object-oriented language, such as Java, and a traditional database. Explain the differences between the two. Object relational mapping is a technique for dealing with these differences. Do some investigating and discuss some of the software solutions that have been developed to solve this problem.
2. Describe SQL superkeys, candidate keys, and primary keys. How do you create a table with a foreign key? Do some research and post some examples with programming code.
Construct a query that will show the number of days that exist between the first invoice and last invoice, for each month, for each employee, using the DATEDIFF function
Estimate the height of the B+ tree. (Giving a range of heights is fine.) Also estimate the amount of memory needed to store the tree, including leaves but not including the posting lists themselves.
Kitchen Gadgets sells a line of high-quality kitchen utensils and gadgets. When customers place orders on the company's Web site or through electronic data interchange (EDI).
LOAD FROM "C:\db2game\tutors.csv" of del insert into tutors (student_id, given_name, family_name, course_code, hourly_wage, status);
What is the role of a DBMS, and what are it advantages? What are its disadvantages?
Create a tree that models the following scenario. A player decides to play a maximum of 4 times, betting on red each time. The player will quit after losing twice. In the tree, any possible last plays will be an ending point of the tree.
Create the tables and relationships from the database design discussed in Lab 2. Add at least five (5) records into each table (Note: You must determine the field values)
Complete following task. In each exercise, represent answer in both DBDL and with diagram. You may use any of styles for diagram. Create database to produce following reports. Do not use any surrogate keys in design.
Structured Methodologies, Data Flow Diagrams, Entity Relationship diagrams, Structured English, Decision Tables and Cohesion/coupling.
Select one of the Real World Scenarios and use the experience you have that is related to the scenario you have chosen or research online; and then post your comments and solutions about your experience.
Display all the LastNames from the Customers table and any associated OrdersIDs from the Orders Table. Show the LastName even if they do not have any associated orders. Order the results by LastName in ascending order.
Describe how you would implement relationship between employees and projects in each of the given scenarios: Many employees can work on given project, but each employee can work on only single project.
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