Structured Query Language (SQL) (pronounced /ˌɛsˌkjuˈɛl/ S-Q-L; or alternatively as /ˈsiːkwəl/ "sequel") is a domain-specific language used to manage...
45 KB (4,039 words) - 14:29, 16 July 2025
In computing, SQL injection is a code injection technique used to attack data-driven applications, in which malicious SQL statements are inserted into...
47 KB (4,983 words) - 12:15, 18 July 2025
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...
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Transact-SQL (T-SQL) is Microsoft's and Sybase's proprietary extension to the SQL (Structured Query Language) used to interact with relational databases...
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database management system (RDBMS) emphasizing extensibility and SQL compliance. PostgreSQL features transactions with atomicity, consistency, isolation,...
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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...
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NoSQL (originally meaning "Not only SQL" or "non-relational") refers to a type of database design that stores and retrieves data differently from the...
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Microsoft SQL Server is a proprietary relational database management system developed by Microsoft using Structured Query Language (SQL, often pronounced...
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MySQL (/ˌmaɪˌɛsˌkjuːˈɛl/) is an open-source relational database management system (RDBMS). Its name is a combination of "My", the name of co-founder Michael...
69 KB (6,514 words) - 13:23, 22 July 2025
Data definition language (redirect from Drop (SQL))
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...
9 KB (1,002 words) - 19:09, 27 November 2024
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...
61 KB (7,610 words) - 11:03, 4 May 2025
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....
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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...
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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...
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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...
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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...
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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...
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A relational database management system uses SQL MERGE (also called upsert) statements to INSERT new records or UPDATE or DELETE existing records depending...
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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...
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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...
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Database (section 2000s, NoSQL and NewSQL)
majority use SQL for writing and querying data. In the 2000s, non-relational databases became popular, collectively referred to as NoSQL, because they...
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A distributed SQL database is a single relational database which replicates data across multiple servers. Distributed SQL databases are strongly consistent...
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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....
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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...
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programmers. SQL Plus understands five categories of text: SQL statements PL/SQL blocks SQL Plus internal commands, for example: environment control commands...
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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...
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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...
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Prepared statement (redirect from Prepare (SQL))
(not to be confused with parameterized query) is a feature where the database pre-compiles SQL code and stores the results, separating it from data. Benefits...
17 KB (1,911 words) - 17:32, 3 July 2025
Stored procedure (section Comparison with static SQL)
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...
12 KB (1,298 words) - 23:08, 5 November 2024