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What is SQL - Structured Query Language

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Written by   139
2 years ago

When interacting with databases, we need a language which can talk to the Relational Database Management System (RDBMS). SQL is a language which is used to interact with your database. So how can SQL be used? You can use SQL to get the RDBMS to do the following things for you:

  • Create, retrieve, update and delete data

  • Create and manage the databases

  • Design and create databases

  • Perform administrative tasks like security, user management, import/export etc

SQL implementations differ between different DBMS systems but they all follow the SQL-92 specification.

SQL is 4 different sub languages bundled into the parent SQL language. It consists of the following

Data Query Language (DQL)

  • Used to query the database for information

  • Get information that's already stored there

Data Definition Language (DDL)

  • Used for defining database schemas

Data Control Language (DCL)

  • Used for controlling access to the data in the database

  • User and permission management

Data Manipulation Language (DML)

  • Used for inserting, updating and deleting data from the database

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Comments

I started learning this set up everything but then stopped. Shame really as it seems quite useful. :) My loss i guess. Nice post!

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2 years ago

Hope posts like this will inspire you to learn!

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2 years ago

Nice post

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2 years ago

Thank you!

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2 years ago