INTRODUCTION
A database is a collection of information that is organized so that it can easily be accessed, managed, and updated. In one view, databases can be classified according to types of content: bibliographic, full-text, numeric, and images.
In computing, databases are sometimes classified according to their organizational approach. The most prevalent approach is the relational database, a tabular database in which data is defined so that it can be reorganized and accessed in a number of different ways. A distributed database is one that can be dispersed or replicated among different points in a network. An object-oriented programming database is one that is congruent with the data defined in object classes and subclasses.
Oracle Application Express (Oracle Apex), Oracle Application Express (Oracle APEX) is a rapid web application development tool for the Oracle database. Using only a web browser and limited programming experience, you can develop and deploy professional applications that are both fast and secure. Furthermore, Oracle Application Express (Oracle APEX, previously named Oracle HTML DB) is a software development environment based on the Oracle database.It allows a fast development cycle to be achieved to create web based applications. It can be used for departmental-style applications with a dozen users, but can also scale up to handle thousands of users. The framework itself adds as little as 0.04 second of overhead to each page request; how well an application scales is primarily based on the efficiency of the SQL queries used by the application developer
SOLUTIONS
1. SELECT firstname,lastname,Title, orderdate, cost, retail, retail-cost as "PROFIT"
FROM books B, orders O, orderitems oi, customers C
WHERE O.order#=OI.order#
AND C.customer#=O.customer#
AND OI.isbn=B.isbn
AND Lastname='LUCAS'
AND Firstname='JAKE'
ORDER by retail-cost DESC
2. SELECT lname, Fname,title