Structured Query Language (SQL) (pronounced S-Q-L; historically "sequel") is a domain-specific language used to manage data, especially in a relational...

In computing, SQL injection is a code injection technique used to attack data-driven applications, in which malicious SQL statements are inserted into...

Microsoft SQL Server (Structured Query Language) is a proprietary relational database management system developed by Microsoft. As a database server,...

MySQL (/ˌmaɪˌɛsˌkjuːˈɛl/) is an open-source relational database management system (RDBMS). Its name is a combination of "My", the name of co-founder Michael...

NoSQL (originally referring to "non-SQL" or "non-relational") is an approach to database design that focuses on providing a mechanism for storage and...

PostgreSQL (/ˌpoʊstɡrɛskjuˈɛl/ POHST-gres-kew-EL) also known as Postgres, is a free and open-source relational database management system (RDBMS) emphasizing...

The history of Microsoft SQL Server begins with the first Microsoft SQL Server database product – SQL Server v1.0, a 16-bit relational database for the...

In SQL, null or NULL is a special marker used to indicate that a data value does not exist in the database. Introduced by the creator of the relational...

PL/SQL (Procedural Language for SQL) is Oracle Corporation's procedural extension for SQL and the Oracle relational database. PL/SQL is available in Oracle...

In the context of SQL, data definition or data description language (DDL) is a syntax for creating and modifying database objects such as tables, indices...