Basics of dbms ppt free download

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Actions Shares. No notes for slide. Basic DBMS ppt 1. Presented by : Rajendra Dangwal Branch : C. III Presented to : Mr. Yogesh Jain 2. Purpose of database : 1. Name D. B Fees Name D. Various levels of database implementation concept of abstraction 1. It is closest to database programmer.

Lowest level of database abstraction. It is closest to the database manager. It is an intermediate level of database abstraction. It is the level closest to the users. These tables are called relations. The user of the relational database system may insert new tuples, delete tuples, and modify tuples. In this model data is represented by connection of records and relationships among data are represented by links.

Records are organized as graphs. Records are organized as trees rather than graphs. Represents relationship among its records through parent child relationships. Relational Data Model The relational model was put forward by E.

Codd of the IBM. It is considered as a very important concept in DBMS. Some basic terminologies Relation : A relation is a table i. Tuple : The rows of tables are generally referred to as tuples.

Attributes : The columns of tables are generally referred to as attributes. Degree : The number of attributes in a relation determine the degree of the relation.

Cardinality : The number of tuples in a relation is called the cardinality of the relation. Views A view is a virtual table that does not really exist in its own right but is instead derived from one or more underlying base tables.

It is an excellent way to give people access to some but not all information data abstraction. Database Keys are used to establish and identify relations between tables.