Company Database Design & Implementation

The company has 7departments: Sales, Finance, HR, Support, R&D, Design and IT. There are 50 employees within the various departments.
The company has some large clients, including Sony, HP, Dell, Apple, Novell, Oracle and Sun.
The company products include 5 different PCI components, 3 different infra-red scanners and10 different Bluetooth devices.
Salary and sales information should be in the database as well. Once the database has been created, you need to pull relevant information for Management.
Management would like an overview of sales between 10 000 and 30 000 and also between 40 000 and 200 000.
They also want to know which companies are purchasing products for more than 250 000 per month and which salesmen are linked to those clients.
This database is very important to the company and therefore you need to ensure that there is redundancy. This means that the company needs at least 1 Master database server and three slave servers.
Since the company is building a web application where companies will be able to place orders and company employees will be able to pull information, securing the queries is important. Therefore, management would like a better understanding of how SQL injections happen and what measures can be put in place to prevent them.

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