According to aggregation, the relation between any two entities is considered as a single entity. Any relationship with its respective entities is aggregated in a higher level entity. For instance, Any course entity is offered by the center entity as a single entity in the corresponding relationship with any other entity visitor. According to … Read more

ER MODEL The ER model is a high-level data model which stands for the Entity-Relationship Model. The ER Model is used for defining the relationship and elements for any specific system. The ER model or the structure of the database is represented as a diagram known as the entity-relationship diagram. It based on a conceptual … Read more

The number of occurrences in one entity, which is correlated with the times of events in another entity defines the degree of relationship. There is a three degree of relationship: One-to-one (1:1) One-to-many (1: M) Many-to-many (M: N) 1. One-to-one According to the One-to-one relationship, anyone occurrence in the entity is related to exclusively one … Read more

The databases are represented by the notations, and the following notations are reduced to the collection of tables. In the databases, every relationship or entity set can be denoted in the tabular forms. This is the ER diagram: There are various points for the conversion of the ER diagram to the table: The respective Entity … Read more

  Understanding Keys in Relational Database Keys are an integral element of Relational database model. These are used in identifying and establishing relationships between tables. Moreover, keys are necessary in recognizing any row of data or record in a table. These can either be a group of aspects or a single aspect wherein the combination … Read more

  An instance of the database is the data stored in a particular database for a limited time. The storage is for the finite interval of time. When we talk about the overall design of the database, then it is called a schema. It is the skeleton structure of the database, which represents the logical … Read more

  Data independence is a different term which represents the usage of the three-schema architecture. It refers to the character trait of being capable of modifying the schema at one level of the database system. It occurs without changing the schema at the next level.   Data independence is of two types: 1. Logical Data … Read more

DBMS Multimedia Database Multimedia database is a collection of multimedia data which includes text, images, graphics (drawings, sketches), animations, audio, video, among others. These databases have extensive amounts of data which can be multimedia and multisource. The framework which manages these multimedia databases and their different types so that the data can be stored, utilized, … Read more

  There are complex data structures in the database systems. Developers use data abstraction to increase the efficiency of the system in retrieving of data and reducing the complexity of these structures for users. Data abstraction means hiding details from users that are not relevant to them. The process helps simplify complex data structures. Data … Read more

  The database management system design depends on its architecture. A large number of computers, database servers, web servers, and other components which are connected with networks are handled by a basic client/server architecture. It consists of a large number of computers and a workstation connected with a network. The architecture of the DBMS depends … Read more