Database

What is Database?

The database is an organized collection of related information. We have stressed "ORGANISED", because only organized information is a database. Any unorganized information is just like a pile or dump, and it cannot be called a database. Organized information or a database serves as an information base you can use it for:-

1.Retrieving desired information.

2.Taking Meaningful Decision

3.Reorganized Information.

4.Processing Information.

Type of  Database: From the technical point of view, there are three type of database are as follows: -

Hierarchical Database: The hierarchical database organized data into a tree structure of files, where each node of the tree contains one type of data. For example, you might organize a banks data in a hierarchical format.

Network Database: The network database structure is an extension of Hierarchical or Tree structure. Instead of only one child node, however network structure can have multiple parent nodes for a child node.

Relational Database: The relational structure is to relate dada records using a standard tabular format. It is used to normally two dimensional tables to describe all relationship between data. For example relational tables could be established to link a college course with the instructor of the course and with location of the classes.

Deference between DBMS and RDBMS:

Elements OF A Database: There are two elements of a database “FIELDS” and “RECORDS”. For example, if there is a database name “STUDENT”, same as below:-

Here every column heading (Ex. ROLL, NAME…) is a field, and every row (Ex. S001, S002…) is a record and every cell (Ex. M SEN, 57.00…) is the field value of a record. So we can say "S005" is the field value of roll of the record number five.

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