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SQL clause
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
Join_(SQL)
Relational database programming language
Structured Query Language (SQL) (pronounced /ˌɛsˌkjuˈɛl/ S-Q-L; or alternatively as /ˈsiːkwəl/ "sequel") is a domain-specific language used to manage
SQL
Database class for storage and retrieval of modeled data
NoSQL (a colloquial title that became formal, meaning "not only SQL" or "non-relational") refers to a type of database design that stores and retrieves
NoSQL
SQL statement
A relational database management system uses SQL MERGE (also called upsert) statements to INSERT new records or UPDATE or DELETE existing records depending
Merge_(SQL)
Marker used in SQL databases to indicate a value does not exist
In the SQL database query language, null or NULL is a special marker used to indicate that a data value does not exist in the database. Introduced by
Null_(SQL)
Topics referred to by the same term
corresponding to the relation join of SQL Join (SQL), relational join, a binary operation on SQL and relational database tables join (Unix), a Unix command similar
Join
2023 edition of the SQL standard
SQL:2023 or ISO/IEC 9075:2023 (under the general title "Information technology – Database languages – SQL") is the ninth edition of the ISO (1987) and
SQL:2023
1992 edition of the SQL standard
SQL-92 (also called SQL 2) was the third revision of the SQL database query language. Unlike SQL-89, it was a major revision of the standard. Aside from
SQL-92
Family of database software by Microsoft
Microsoft SQL Server is a proprietary relational database management system developed by Microsoft using Structured Query Language (SQL, often pronounced
Microsoft_SQL_Server
Free and open-source object relational database management system
database management system (RDBMS) emphasizing extensibility and SQL compliance. PostgreSQL features transactions with atomicity, consistency, isolation,
PostgreSQL
Microsoft's and Sybase's proprietary extension to Structured Query Language
Transact-SQL (T-SQL) is Microsoft's and Sybase's proprietary extension to the SQL (Structured Query Language) used to interact with relational databases
Transact-SQL
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
List_of_SQL_reserved_words
SQL statement that returns a result set of rows from one or more tables
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
Select_(SQL)
Set of rules defining correctly structured programs
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.
SQL_syntax
Database stored query result set
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
View_(SQL)
Command in Unix-like operating systems
collection of native Win32 ports of common GNU Unix-like utilities. coreutils Join (SQL) Relational algebra List of Unix commands printf – Shell and Utilities
Join_(Unix)
Digital database whose organization is based on the relational model of data
by their common attributes. MySQL's approximation of a natural join is the Inner join operator. In SQL, an INNER JOIN prevents a cartesian product from
Relational_database
Type of operation in SQL
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
Set_operations_(SQL)
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
History of Microsoft SQL Server
History_of_Microsoft_SQL_Server
Database manager part of the Microsoft 365 package
procedures, and SQL Server constraints. The views and stored procedures can significantly reduce the network traffic for multi-table joins. SQL Server supports
Microsoft_Access
Distributed query engine
(including PrestoDB, and PrestoSQL which was re-branded to Trino) is a distributed query engine for big data using the SQL query language. Its architecture
Presto_(SQL_query_engine)
A hierarchical query is a type of SQL query that handles hierarchical model data. These are useful for working with databases of graph-structured data
Hierarchical and recursive queries in SQL
Hierarchical_and_recursive_queries_in_SQL
Reduction of data redundancy
sub-language" grounded in first-order logic. An example of such a language is SQL, though it is one that Codd regarded as seriously flawed. The objectives
Database_normalization
Theory of relational databases
databases, particularly query languages for such databases, chief among which is SQL. Relational databases store tabular data represented as relations. Queries
Relational_algebra
2008 edition of the SQL standard
SQL:2008 is the sixth revision of the ISO and ANSI standard for the SQL database query language. It was formally adopted in July 2008. The standard consists
SQL:2008
Organized collection of data in computing
filings, and personnel records. NoSQL databases are often very fast, do not require fixed table schemas, avoid join operations by storing denormalized
Database
become available. Continuous SQL queries in a RDSMS use the SQL Window function to analyze, join and aggregate data streams over fixed or sliding windows
Relational data stream management system
Relational_data_stream_management_system
Mathematical set formed from two given sets
Cartesian product) Direct product Empty product Finitary relation Join (SQL) § Cross join Orders on the Cartesian product of totally ordered sets Outer product
Cartesian_product
SQL clause
A HAVING clause in SQL specifies that an SQL SELECT statement must only return rows where aggregate values meet the specified conditions. HAVING and WHERE
Having_(SQL)
Strozzi NoSQL is a shell-based relational database management system initialized and developed by Carlo Strozzi that runs under Unix-like operating systems
Strozzi_NoSQL
Binary operation in relational algebra
result of a natural join (which degenerates to Cartesian product when there are no shared attributes). In SQL implementations, joining on a predicate is
Join_(relational_algebra)
SQL statement
PostgreSQL, when a FROM clause is present, the target table is joined to the tables mentioned in the fromlist, and each output row of the join represents
Update_(SQL)
Database management system
system (RDBMS) sharing a common heritage with MySQL, from which it was forked in 2009 by original MySQL developers following Oracle Corporation's acquisition
MariaDB
Mathematical operation
the middle component. For example, in the query language SQL there is the operation join (SQL). Demonic composition – Mathematical operation Friend of
Composition_of_relations
Programming language
database-independent ABAP statements ("Open SQL") into statements understood by the underlying DBMS ("Native SQL"). The database interface handles all the
ABAP
Unicode is new in version 10.0. Note (5): MySQL provides GUI interface through MySQL Workbench. Note (6): OpenEdge SQL database engine uses Referential Integrity
Comparison of relational database management systems
Comparison_of_relational_database_management_systems
Auto-sharding technology for MySQL databases
MySQL Cluster, also known as MySQL NDB Cluster, is a technology providing shared-nothing clustering and auto-sharding for the MySQL database management
MySQL_Cluster
SQL toolkit and object-relational mapper
SQLAlchemy is an open-source Python library that provides an SQL toolkit (called "SQLAlchemy Core") and an object–relational mapper (ORM) for database
SQLAlchemy
Relational model database server
SAP ASE (Adaptive Server Enterprise), originally known as Sybase SQL Server, and also commonly known as Sybase DB or Sybase ASE, is a relational model
Adaptive_Server_Enterprise
StreamSQL is a query language that extends SQL with the ability to process real-time data streams. SQL is primarily intended for manipulating relations
StreamSQL
Database software
Ingres Database (/ɪŋˈɡrɛs/ ing-GRESS) is a proprietary SQL relational database management system intended to support large commercial and government applications
Ingres_(database)
Database design graphical tool
MySQL AB and joined the company to take over the development of graphical user interface (GUI) tools for MySQL. This led to the creation of the MySQL GUI
MySQL_Workbench
Topics referred to by the same term
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
Null
Open-source analytics and visualization platform
Prometheus, AWS CloudWatch, Graphite, InfluxDB, Elasticsearch, PostgreSQL, and MySQL. Torkel Odegaard released Grafana in January 2014 as an outgrowth of
Grafana
Programming technique
its SQL form, as the data is stored in its original object representation and relationships are directly represented, rather than requiring join tables/operations
Object–relational_mapping
Java-based database engine
SQL Database) is a relational database management system written in Java. It has a JDBC driver and supports a large subset of SQL-92, SQL:2008, SQL:2011
HSQLDB
Algorithm that combines multiple sorted lists into one
them into a single iterator. Merge (revision control) Join (relational algebra) Join (SQL) Join (Unix) Skiena, Steven (2010). The Algorithm Design Manual
Merge_algorithm
Query language for property graphs
standards. GQL is intended to be a declarative database query language, like SQL. The 2019 GQL project proposal states: "Using graph as a fundamental representation
Graph_Query_Language
Compound operation in relational databases
recursive CTEs include Microsoft SQL Server, Oracle, PostgreSQL and others. Join Hierarchical and recursive queries in SQL Zygiaris, Sotirios (2018-08-23)
Recursive_join
Database management software
SQL Database Studio is professional client for Microsoft SQL Server developed by Jan Prochazka in Czech Republic. SQL Database Studio (SDS) is used by
SQL_Database_Studio
Microsoft .NET Framework component
extends the language by the addition of query expressions, which are akin to SQL statements, and can be used to conveniently extract and process data from
Language_Integrated_Query
Concept in relational database design
keys. Unique keys are an alternative to the primary key of the relation. In SQL, the unique keys have a UNIQUE constraint assigned to them in order to prevent
Unique_key
SQL statement
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
Insert_(SQL)
ODBC, standard interface for accessing database systems
all SQL systems, or a programming interface that left the SQL as plain text until it was called. Dynamic SQL systems became a major focus for SQL vendors
Open_Database_Connectivity
Effect in mathematics from combinations
database querying in languages such as SQL. If a join operator is applied to multiple tables without specifying a join condition (such as a foreign key reference)
Cartesian_explosion
Computing operation which compares two values
name) <=> std::tie(b.unit, b.rank, b.name) In some SQL dialects, <=> is used as a null-safe join operator which will match operands if both are null
Three-way_comparison
Sequence of steps used to access data in a SQL relational database management system
access data in a SQL relational database management system. This is a specific case of the relational model concept of access plans. Since SQL is declarative
Query_plan
Query language
language for data mining models supported by Microsoft's SQL Server Analysis Services product. Like SQL, it supports a data definition language (DDL), data
Data_Mining_Extensions
Cloud-based web application hosting service
Google Cloud Datastore database has a SQL-like syntax called "GQL" (Google Query Language). GQL does not support the join statement. Instead, one-to-many and
Google_App_Engine
Open-source data analytics software
implementation to use (You can specify the implementation of JOIN in SQL, thus "... for many SQL applications the query writer may not have enough knowledge
Apache_Pig
Database using graph structures for queries
result in the following SQL query. SELECT p2.person_name FROM people p1 JOIN friend ON (p1.person_id = friend.person_id) JOIN people p2 ON (p2.person_id
Graph_database
such as HTML or XML, but does include domain-specific languages such as SQL and its dialects. Contents: 0–9 A B C D E F G H I J K L M N O P Q R S T
List_of_programming_languages
Database of data representing objects in geometric space
Thus, a spatial join between a points layer of cities and a polygon layer of countries could be performed in a spatially-extended SQL statement as: SELECT
Spatial_database
Feature of SQL
joins (i.e. joining a table with itself.) In SQL, you can alias tables and columns. A table alias is called a correlation name, according to the SQL standard
Alias_(SQL)
Set of conceptual and technical difficulties
like Oracle and Microsoft SQL Server solve this. OO code (Java and .NET respectively) extend them and are invokeable in SQL as fluently as if built into
Object–relational impedance mismatch
Object–relational_impedance_mismatch
Cloud computing platform by Microsoft
devices and cloud storage. Azure SQL Database works to create, scale, and extend applications into the cloud using Microsoft SQL Server technology. It also
Microsoft_Azure
Database running on a cloud computing platform
NoSQL storage does not require fixed table schemas, and join operations are typically avoided. NoSQL databases have been shown to provide efficient horizontal
Cloud_database
Cloud-based service and infrastructure
unstructured data Cloud SQL – Database as a Service based on MySQL, PostgreSQL and Microsoft SQL Server Cloud Bigtable – Managed NoSQL database service Cloud
Google_Cloud_Platform
Database management system
includes: database systems with differing application programming interfaces (SQL as well as proprietary, native APIs) database architectures (client-server
Embedded_database
Discontinued MySQL management system
releases of MySQL. By joining efforts of a few companies and incorporating various changes and new features into MySQL, WebScaleSQL aimed toward fulfilling
WebScaleSQL
Database model
in a SQL database schema corresponds to a predicate variable; the contents of a table to a relation; key constraints, other constraints, and SQL queries
Relational_model
Function provided by the user of a program or environment
compiling a SQL statement. SQL-data access - tells the database management system whether the function contains no SQL statements (NO SQL), contains SQL statements
User-defined_function
Proprietary database management system
1979, it was among the earliest commercially available databases to use SQL, and as of 2026 it is ranked as the most popular database management system
Oracle_Database
Strategy used on previously-normalized databases
method is often implemented in SQL as indexed views (Microsoft SQL Server) or materialized views (Oracle, PostgreSQL). A view may, among other factors
Denormalization
support natural joins, for familiarity, the example will show only a "traditional" join. Here is the equivalent SQL for comparison: -- (SQL version) SELECT
IBM_Business_System_12
Type of database query
the operations union or difference) and to select-from-where queries in SQL in which the where-condition uses exclusively conjunctions of atomic equality
Conjunctive_query
In databases, cached query results
has been realised since the 2000 version of SQL Server. Example syntax to create a materialized view in SQL Server: CREATE VIEW MV_MY_VIEW WITH SCHEMABINDING
Materialized_view
Database transaction integrity concept
SQL-transactions that produces the same effect as some serial execution of those same SQL-transactions. A serial execution is one in which each SQL-transaction
Isolation_(database_systems)
Computer query in SQL
In a SQL database query, a correlated subquery (also known as a synchronized subquery) is a subquery (a query nested inside another query) that uses values
Correlated_subquery
Data structure for query optimization in databases
be done in SQL with CREATE INDEX my_index ON my_table (id) INCLUDE (name);. No standard defines how to create indexes, because the ISO SQL Standard does
Database_index
Software programming technique
( "database/sql" "time" ) type ( UserStorage struct { conn *sql.DB } User struct { Name string 'json:"name" db:"name,primarykey"' JoinedAt time.Time 'json:"joined_at"
Dependency_injection
Steven Feuerstein is an author focusing on the Oracle database PL/SQL language, having published several books on this language through O'Reilly Media
Steven_Feuerstein
Cross-platform document-oriented database
source-available, cross-platform, document-oriented database program. Classified as a NoSQL database product, MongoDB uses JSON-like documents (called BSON) with optional
MongoDB
Relational databases concept
defined in the ISO SQL Standard, through the PRIMARY KEY constraint. The syntax to add such a constraint to an existing table is defined in SQL:2003 like this:
Primary_key
for all authorized users in a SQL database. Several other databases (including Microsoft SQL Server, MySQL, PostgreSQL, SQLite, and Teradata) enable one
DUAL_table
American multinational computer corporation
2025. Mace, Scott (January 18, 1988). "Ashton-Tate, Microsoft Join Forces To Introduce SQL Database Server". InfoWorld. Vol. 10, no. 3. pp. 1, 8. Retrieved
Oracle_Corporation
Database engine
Hive gives an SQL-like interface to query data stored in various databases and file systems that integrate with Hadoop. Traditional SQL queries must be
Apache_Hive
Open source object-relational mapping framework
database-specific provider that translates the Entity SQL command tree into a query in the native SQL flavor of the database. It includes the Store-specific
Entity_Framework
Database management system
become incorporated into SQL:1999 via structured types. In fact, any product that adheres to the object-oriented aspects of SQL:1999 could be described
Object–relational_database
Feature to efficiently execute queries efficiently in DBMS softwares
table join techniques (e.g., merge join, hash join, product join). The search space can become quite large depending on the complexity of the SQL query
Query_optimization
Relational model database server
key development of the System R project was the Structured Query Language (SQL). To apply the relational model, Codd needed a relational-database language
IBM_Db2
Structured Query Language queries. SRDE parses SQL queries and sends them to the MKDE to run. The SRDE implements SQL-92. Significant other features include relational
Actian_Zen
American software company
Baker and Tom Meurer — to bet the company on the effort. Several executives joined the effort over the next three years, including Andrew Filipowski, Robert
Cullinet
Relational database management system
Windows or Web thin client. Dataphor does not employ SQL as its primary database language since SQL purportedly violates important principles of the relational
Dataphor
Cloud-based NoSQL document database service
Google Cloud Datastore is a NoSQL database service provided by Google Cloud Platform. It is a fully managed database which can handle massive amounts
Google_Cloud_Datastore
Cloud-based NoSQL database service
traditional relational databases, Cosmos DB is a NoSQL (meaning "Not only SQL", rather than "zero SQL") and vector database, which means it can handle unstructured
Cosmos_DB
Open-source data analytics cluster computing framework
Python interfaces to most of Spark's components, including Spark Core, Spark SQL and the DataFrame API, Structured Streaming, and MLlib; since Spark 4.1 it
Apache_Spark
Framework and distributed processing engine
such as selection, aggregation, and joins on Tables. Tables can also be queried with regular SQL. The Table API and SQL offer equivalent functionality and
Apache_Flink
Topics referred to by the same term
assignment, an operator for multiplication A relational database join, in deprecated SQL syntax /= (disambiguation) This disambiguation page lists articles
*=
Relational database engine for Apache Hadoop
JDBC driver that hides the intricacies of the NoSQL store enabling users to create, delete, and alter SQL tables, views, indexes, and sequences; insert
Apache_Phoenix
JOIN SQL
JOIN SQL
Boy/Male
Hindu
Good character
Boy/Male
Hindu
God has been gracious: has shown favor in the bible John the baptist baptized christ in the jordan
Girl/Female
American, Australian, British, Chinese, Christian, English, Hebrew
Modern Female Version of John and Jon; The Lord is Gracious
Boy/Male
English French
or abbreviation of Jonathan 'Jehovah has been gracious; has shown favor.
Girl/Female
English American
Modern feminine of John and Jon.
Female
English
Medieval English contracted form of Old French Johanne, JOAN means "God is gracious." Compare with masculine Joan.
Female/Male/Unisex
Korean
(豪金) Korean name JIN-HO means "golden hero/leader."
Male
Finnish
Finnish form of Greek Ioannes (Latin Johannes), JONI means "God is gracious."
Male
English
 Anglicized form of Greek Ioannes (Latin Johannes), JOHN means "God is gracious." In the bible, this is the name of many characters, including John the Baptist.
Boy/Male
American, British, English, French, Greek, Hebrew
God is Gracious; Jehovah has been Gracious; Variant of John or Abbreviation of Jonathan Jehovah has been Gracious; Has Shown Favor
Male
English
 Pet form of English Jonathan, JON means "God has given." Compare with other forms of Jon.
Boy/Male
Irish
Form of John the Baptist.
Surname or Lastname
English, Welsh, German, etc.
English, Welsh, German, etc. : ultimately from the Hebrew personal name yÅÌ£hÄnÄn ‘Jehovah has favored (me with a son)’ or ‘may Jehovah favor (this child)’. This personal name was adopted into Latin (via Greek) as Johannes, and has enjoyed enormous popularity in Europe throughout the Christian era, being given in honor of St. John the Baptist, precursor of Christ, and of St. John the Evangelist, author of the fourth gospel, as well as others of the nearly one thousand other Christian saints of the name. Some of the principal forms of the personal name in other European languages are Welsh Ieuan, Evan, Siôn, and Ioan; Scottish Ia(i)n; Irish Séan; German Johann, Johannes, Hans; Dutch Jan; French Jean; Italian Giovanni, Gianni, Ianni; Spanish Juan; Portuguese João; Greek IÅannÄ“s (vernacular Yannis); Czech Jan; Russian Ivan. Polish has surnames both from the western Slavic form Jan and from the eastern Slavic form Iwan. There were a number of different forms of the name in Middle English, including Jan(e), a male name (see Jane); Jen (see Jenkin); Jon(e) (see Jones); and Han(n) (see Hann). There were also various Middle English feminine versions of this name (e.g. Joan, Jehan), and some of these were indistinguishable from masculine forms. The distinction on grounds of gender between John and Joan was not firmly established in English until the 17th century. It was even later that Jean and Jane were specialized as specifically feminine names in English; bearers of these surnames and their derivatives are more likely to derive them from a male ancestor than a female. As a surname in the British Isles, John is particularly frequent in Wales, where it is a late formation representing Welsh Siôn rather than the older form Ieuan (which gave rise to the surname Evan). As an American family name this form has absorbed various cognates from continental European languages. (For forms, see Hanks and Hodges 1988.)
Male
Irish
Irish Gaelic form of Greek Ioannes, EOIN means "God is gracious."
Male
Scandinavian
 Scandinavian form of Icelandic Jóhann, JON means "God is gracious." Compare with other forms of Jon.
Female
English
Variant spelling of English Joy, JOI means "joy."
Boy/Male
Latin
Form of Jovan 'Father of the sky.
Boy/Male
American, Australian, British, Chinese, Christian, Danish, Dutch, English, French, German, Greek, Hebrew, Japanese, Norwegian, Swedish, Swiss, Ukrainian
The Lord is Gracious; God has Given; Gift of God; God is Gracious; Jehovah has been Gracious; Variant of John; Abbreviation of Jonathan
Boy/Male
Scandinavian
Female
English
Variant spelling of English Jonie, JONI means "God is gracious."
JOIN SQL
JOIN SQL
Girl/Female
Hindu
Triwin
Girl/Female
Tamil
Drishy | தà¯à®°à¯€à®·à¯à®¯
Sight
Boy/Male
Muslim
Selfless
Boy/Male
Hindu, Indian, Kannada, Oriya, Sanskrit, Telugu
Elevated; Prospered; Raised
Girl/Female
Hindu, Indian
Smile of Goddess Lalita
Male
Hebrew
 Variant spelling of Aramaic/Hebrew Shai, SHAY means "gift." Compare with another form of Shay.
Boy/Male
Hindu
Boy/Male
Indian
Blessing
Boy/Male
Greek American English
The Greek form of the Hebrew Elijah, meaning Jehovah is God.
Boy/Male
Tamil
Sight
JOIN SQL
JOIN SQL
JOIN SQL
JOIN SQL
JOIN SQL
n.
The place or part where two things or parts are joined or united; the union of two or more smooth or even surfaces admitting of a close-fitting or junction; junction as, a joint between two pieces of timber; a joint in a pipe.
v. t.
To separate the joints; of; to divide at the joint or joints; to disjoint; to cut up into joints, as meat.
n.
A joining of two things or parts so as to admit of motion; an articulation, whether movable or not; a hinge; as, the knee joint; a node or joint of a stem; a ball and socket joint. See Articulation.
a.
United, joined, or sharing with another or with others; not solitary in interest or action; holding in common with an associate, or with associates; acting together; as, joint heir; joint creditor; joint debtor, etc.
v. t.
To associate one's self to; to be or become connected with; to league one's self with; to unite with; as, to join a party; to join the church.
v. t.
To join; to connect; to unite; to combine.
p. pr. & vb. n.
of Join
imp. & p. p.
of Join
v. i.
To be contiguous, close, or in contact; to come together; to unite; to mingle; to form a union; as, the hones of the skull join; two rivers join.
v. t.
To make of a definite fineness, and convert into coins, as a mass of metal; to mint; to manufacture; as, to coin silver dollars; to coin a medal.
v. t.
To make or fabricate; to invent; to originate; as, to coin a word.
v. i.
To fit as if by joints; to coalesce as joints do; as, the stones joint, neatly.
v. t.
To provide with a joint or joints; to articulate.
a.
Joined; united; combined; concerted; as joint action.
n.
The space between the adjacent surfaces of two bodies joined and held together, as by means of cement, mortar, etc.; as, a thin joint.
a.
Shared by, or affecting two or more; held in common; as, joint property; a joint bond.
v. t.
To accept, or engage in, as a contest; as, to join encounter, battle, issue.
n.
The part or space included between two joints, knots, nodes, or articulations; as, a joint of cane or of a grass stem; a joint of the leg.
v. t.
To unite by a joint or joints; to fit together; to prepare so as to fit together; as, to joint boards.