Database Assignment Help, Homework Solution

What is a database?
A database is a collection of organized information that can be easily accessed. A programmer uses a database program to create files, update information, perform querying and report functions and to enter data. Traditionally, a database management system (DBMS) is a term used for database software.  Database programming is not for the faint-hearted. When a user wants data in a single file to automatically update another, programming has to be done. A programmer performs the following tasks when interacting with a database;

Creating a file(Table) and set an index order
Creating data entry forms
Updating/ editing
Viewing/querying
Reporting
Modifying structure
Types of database model
A database model is a coherent structure or logical design of the information that defines the relationship between data. There are four main types of database models, namely;

Hierarchical model-In this type of model data is organized in a tree-like structure. It is also commonly known as a one-many relationship model. Each unit in the model has only one parent and data is stored in the form of a record. The user creates a link to associate the records with one another.
Flat model- In this type of model a database is represented as a table. The data in the rows are related with one another and those in the columns have the similar values.
Network database model- this type of database model is also known as many-many relationship model. The parent field has many branches that end up to it.
Relational model- Information is represented in this type of model in the form of a table. This table has rows and columns which are interrelated. It is the most widely used database model.
Database languages
A programmer uses special-purpose languages when he wants to perform one or more tasks. Structured Query language which is abbreviated as (SQL), is used in manipulating, storing and retrieving data. These SQL processes require various components like:

Query dispatcher
Optimization engine
Classic query engine
There are four main groups of SQL commands that are used to interact with relational databases. They are;

DCL- Data Control Language controls access to data
DDL- Data definition language is used for the definition of data types. It performs functions such as creating, altering and dropping.
DML- Data Manipulation Language is used when performing tasks such as inserting, updating and deleting occurrences in data.
DQL-It allows the programmer to search for computing derived information.
Types of Database Systems
MySQL-It is the most popular relational database management system because it can work on several operating systems. It can be customised to allow easy modification of large amount of data. It is very popular because it is an open source and can be purchased for free

SQL Server-It is a relational database management system developed by Microsoft. It is equipped with data management tools that allow the user to optimize, create, replicate, schedule and maintain data.

Oracle-It is also a form of relational database management system that is flexible in managing large data and cost-effective.It uses SQL to permit users to access data objects directly. Oracle can run in many operating systems such as UNIX, Linux and Windows etc. oracle has two main types of structures within its architecture;the logical structure and the physical structure.

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