• Post category:StudyBullet-13
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Sql, Queries, Triggers, Transactions, Concurrency, Database Management Systems DBMS, RDBMS

What you will learn

SQL

Database Design

Normalisation

Transaction

B and B+ trees

Relational database

Description

SQL is a domain-specific language used in programming and designed for managing data held in a relational database management system, or for stream processing in a relational data stream management system.It is pronounced as S-Q-L or sometime See-Qwell. SQL is a database language, it is used for database creation, deletion, fetching rows, and modifying rows, etc.

What is SQL

  • SQL stands for Structured Query Language.
  • It is designed for managing data in a relational database management system (RDBMS).
  • It is pronounced as S-Q-L or sometime See-Qwell.
  • SQL is a database language, it is used for database creation, deletion, fetching rows, and modifying rows, etc.
  • SQL is based on relational algebra and tuple relational calculus.

All DBMS like MySQL, Oracle, MS Access, Sybase, Informix, PostgreSQL, and SQL Server use SQL as standard database language.


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Why SQL is required

SQL is required:

  • To create new databases, tables and views
  • To insert records in a database
  • To update records in a database
  • To delete records from a database
  • To retrieve data from a database

What SQL does

  • With SQL, we can query our database in several ways, using English-like statements.
  • With SQL, a user can access data from a relational database management system.
  • It allows the user to describe the data.
  • It allows the user to define the data in the database and manipulate it when needed.
  • It allows the user to create and drop database and table.
  • It allows the user to create a view, stored procedure, function in a database.
  • It allows the user to set permission on tables, procedures, and views.
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