Online Classes For Database Management And SQL

The database management system (DBMS) is the programme that captures and analyses data by interacting with end-users, applications, and the database itself. A database management system (DBMS) provides a structured approach to managing databases through an interface for users as well as workloads that access databases via apps.

Information contained in databases is one of the three management tasks for DBMS. Access and modification processes are examples of database processes. The logic layout of the database is another element of DBMS.

Watch the video below for a brief introduction to DBMS

A database management system (DBMS) is a valuable method in a variety of industries. Shift management, disaster recovery, compliance, and performance control are only a few of the administrative tasks that DBMS makes easier.

Organizations can better manage their data security with the help of DBMS while ensuring quick and effective communication between users. Within an organization, DBMS would result in uniform management and administration. As a result, learning DBMS is a must-have skill in the IT industry.

Modelling in Database Management System

In a database management system, data models are essential components for introducing abstraction. Data models describe how data is linked to one another, as well as how it is processed and stored within the system.

The following are the several types of Data Models

1. Entity-Relationship Model

In a particular domain of knowledge, an entity-relationship model or ER model defines interconnected objects of interest. An ER model is made up of entity types, which define the objects of interest and relationships between them. It comes up with a database's conceptual design. It also creates a data visualization that is both quick and easy to design. An entity-relationship diagram is used in ER modelling to depict the database structure.

2. Relational Model

A table is described as an n-ary relation in this model, which is based on first-order predicate logic. Each table row represents a collection of data values that are related to one another.The table and column names aid in deciphering the significance of each row's values. The physical storage of data, on the other hand, is unrelated to the logical organization of the data.

3. Hierarchical database model

The hierarchical model organizes data into a tree-like structure with a single parent or root for each record. The order is used to store the database in physical order. This model can be used to describe a wide range of real-world relationships.

4. Network Model

Since it allows for many-to-many relationships to be handled in a tree-like system with multiple parents, the network model is an extension of the hierarchical structure. It is more effective at representing data redundancy than the hierarchical model.

5. Object-Oriented Data Model

The data model in which data is stored in the form of objects, which are instances of classes, is known as an object-oriented database management system. An object-oriented data model is comprised of these classes and properties. Real-world problems are interpreted as objects with various attributes in this process. Every entity has a number of interconnected relationships.

6. Object-Relational Model

It's a database management system (DBMS) that's similar to a relational database but with an object-oriented database model. Objects, classes, and inheritance are all supported explicitly in database schemas and query languages. Furthermore, it allows the data model to be extended with custom data types and methods, much like pure relational structures.

Here is an online session of Newton School Launchpad on Modelling in DBMS

Structured Query Language

SQL is a standard language that is used to access and manipulate databases.Tuple relational calculus and relational algebra are the foundations of this system. It is, in essence, a relational database design language. A relational database is one in which data is stored and retrieved as links. MySQL, Oracle, Sybase, SQL Server, Postgre, and others are examples of relational databases.

SQL is a collection of languages for both data definition and data manipulation. SQL's data definition properties can be used to design and alter database schemas, while SQL's data manipulation properties can be used to store and retrieve data from the database.

Learn more about SQL in the video below

Types of SQL

1. Data Definition Language (DDL)

The Data Definition Language aids in the development of a database structure or schema. There are four types of DDL Command

  • ​Create

  • ​Drop

  • ​Alter

  • ​Truncate

2. Data Manipulation Language

The database is modified using DML commands. It is in control of all database changes. The three commands that come under DML are:

  • ​Insert

  • ​Update

  • ​Delete

3. Data Control Language

One of the logical classes of SQL Commands is Data Control Language. This command has something to do with security. It allows or prevents the user from accessing data in the database schema using the DCL command. The two commands in DCL are:

  • ​Grant

  • ​Revoke

4. Transaction Control Language

TCL commands are used to manage database transactions. Commands in TCL are as follows:

  • ​Commit

  • ​Rollback

  • ​Savepoint

  • ​Set Transaction

5. Data Query Language

DQL is used to obtain data from the database. It uses the select command.

To learn more about Database Management and SQL, register at Newton School Launchpad for FREE. Pratik Bhattacharya, a senior software engineer at Microsoft and passionate techie is the instructor of the course. Not only that, you can clarify your doubts, solve exciting assignments and get a certificate after completion. Register now!