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Learn about the syntax of the SQL programming language, which is defined and maintained by ISO/IEC SC 32. See the language elements, operators, functions, queries, statements, and data manipulation operations with examples and references.
Learn how to use join clauses in SQL to combine columns from one or more tables into a new table. Compare different join types, such as cross join, inner join, left join, right join and full join, with examples and syntax.
Learn about the process of structuring a relational database in accordance with normal forms to reduce data redundancy and improve data integrity. See the objectives, anomalies, and normal forms of database normalization with examples and references.
W3Schools is a freemium educational website for learning coding online, launched in 1998 by Refsnes Data in Norway. It offers courses, tutorials, templates, and a live editor for various web technologies, such as HTML, CSS, JavaScript, Python, and more.
A database is an organized collection of data or a type of data store based on a database management system (DBMS). Learn about the history, design, functions and classification of databases and DBMSs, from navigational to NoSQL, and their applications.
SQL injection is a code injection technique used to attack data-driven applications, by inserting malicious SQL statements into an entry field for execution. Learn how SQL injection works, its root causes, its types, and its history from this Wikipedia article.
A stored procedure is a subroutine stored in a database that can perform data validation, access control, or complex processing. Learn how stored procedures are implemented in different database systems, how they compare with other features, and see examples of SQL and Java stored procedures.
SQL is a declarative language used to manage data, especially in a relational database management system (RDBMS). It consists of many types of statements, such as Data Query Language (DQL), Data Definition Language (DDL), Data Control Language (DCL), and Data Manipulation Language (DML).