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

Structured Query Language (SQL) (pronounced /ˌɛsˌkjuˈɛl/ S-Q-L; or alternatively as /ˈsiːkwəl/ "sequel") is a domain-specific language used to manage...

The SQL SELECT statement returns a result set of rows, from one or more tables. A SELECT statement retrieves zero or more rows from one or more database...

NoSQL (originally meaning "Not only SQL" or "non-relational") refers to a type of database design that stores and retrieves data differently from the...

Transact-SQL (T-SQL) is Microsoft's and Sybase's proprietary extension to the SQL (Structured Query Language) used to interact with relational databases...

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

reserved. SQL SQL syntax List of relational database management systems Page listing all reserved words in the SQL standard, from SQL-92 to SQL:2016: Standard...

database management system (RDBMS) emphasizing extensibility and SQL compliance. PostgreSQL features transactions with atomicity, consistency, isolation,...

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...

Microsoft SQL Server is a proprietary relational database management system developed by Microsoft using Structured Query Language (SQL, often pronounced...

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...

The syntax of the SQL programming language is defined and maintained by ISO/IEC SC 32 as part of ISO/IEC 9075. This standard is not freely available....

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...

A join clause in the Structured Query Language (SQL) combines columns from one or more tables into a new table. The operation corresponds to a join operation...

An SQL INSERT statement adds one or more records to any single table in a relational database. Insert statements have the following form: INSERT INTO...

A relational database management system uses SQL MERGE (also called upsert) statements to INSERT new records or UPDATE or DELETE existing records depending...

A hierarchical query is a type of SQL query that handles hierarchical model data. They are special cases of more general recursive fixpoint queries, which...

The SQL From clause is the source of a rowset to be operated upon in a Data Manipulation Language (DML) statement. From clauses are very common, and will...

operations in SQL is a type of operations which allow the results of multiple queries to be combined into a single result set. Set operators in SQL include...

majority use SQL for writing and querying data. In the 2000s, non-relational databases became popular, collectively referred to as NoSQL, because they...

in SQL specifies that an SQL SELECT statement must only return rows where aggregate values meet the specified conditions.: 125–127  HAVING and WHERE are...

A GROUP BY statement in SQL specifies that a SQL SELECT statement partitions result rows into groups, based on their values in one or several columns....

In SQL, the TRUNCATE TABLE statement is a data manipulation language (DML) operation that deletes all rows of a table without causing a triggered action...

interferometry to block certain sources of light Null (SQL) (or NULL), a special marker and keyword in SQL indicating that a data value does not exist, is not...

A LAMP (Linux, Apache, MySQL, Perl/PHP/Python) is one of the most common software stacks for the web's most popular applications. Its generic software...

A distributed SQL database is a single relational database which replicates data across multiple servers. Distributed SQL databases are strongly consistent...

Although it is a lightweight embedded database, SQLite implements most of the SQL standard and the relational model, including transactions and ACID guarantees...

Therefore, an ORDER BY clause in the view definition is meaningless; the SQL standard (SQL:2003) does not allow an ORDER BY clause in the subquery of a CREATE...

introduction of procedural elements to the SQL language in the SQL:1999 and SQL:2003 standards in the part SQL/PSM. That made SQL an imperative programming language...

programmers. SQL Plus understands five categories of text: SQL statements PL/SQL blocks SQL Plus internal commands, for example: environment control commands...