SQL Tutorials
Our SQL tutorial teaches you SQL step by step in an easy way, so you can quickly start working with databases. It covers all the key concepts from basic to advanced to help you understand how SQL works.If you want to master SQL quickly, this SQL Tutorials is for you.SQL (Structured Query Language) is a programming language which is used to manage data stored in relational databases like MySQL, MS Access, SQL Server, Oracle, Sybase, Informix, Postgres etc.SQL is a database computer language designed for the retrieval and management of data in a relational databases like MySQL, MS Access, SQL Server, Oracle, Sybase, Informix, Postgres etc. SQL stands for Structured Query Language. SQL was developed in the 1970s by IBM Computer Scientists.
Here are some key features of Structured Query Language (SQL):
Data Definition Language (DDL): SQL provides a set of commands to define and modify the structure of a database, including creating tables, modifying table structure, and dropping tables.
Data Manipulation Language (DML): SQL provides a set of commands to manipulate data within a database, including adding, modifying, and deleting data.
Query Language: SQL provides a rich set of commands for querying a database to retrieve data, including the ability to filter, sort, group, and join data from multiple tables.
Data Definition language (DDL):
Data Definition Language (DDL) is a subset of SQL (Structured Query Language) used to define, manage, and modify the structure or schema of a database. DDL commands deal with the database objects themselves, such as tables, indexes, and views, rather than the data within them.
Create,Drop,Alter, Rename
Data Manipulation Language (DML):
Data Manipulation Language (DML) is a subset of SQL (Structured Query Language) used for managing and manipulating data within a relational database. The commands focus on the records inside the tables, allowing you to add, retrieve, update, and delete data.Insert,Delete,Update,Trigers.
DQL – Data Query Language:
Data Query Language (DQL) is the subset of SQL concerned with retrieving data from a database. The sole command in DQL is SELECT, which is used to query data from one or more tables. The result of a SELECT statement is a temporary table known as the result-set.From,Where,Group By,Having,Orderby,Distinct.
Transaction Control Language (TCL) :
Transaction Control Language (TCL)is a subset of SQL used to manage and control the transactions made to a database. A transaction is a sequence of one or more SQL statements that are executed as a single, indivisible unit of work. TCL commands are primarily used with DML commands such as INSERT, UPDATE, and DELETE to ensure data integrity and consistency, especially in multi-user environments.
Data Control Language (DCL):
Data Control Language (DCL) is a subset of SQL (Structured Query Language) that database administrators use to manage user permissions, access rights, and security within a database. DCL commands control what users can do and see, ensuring data integrity and confidentiality.Grant,Revoke,Deny