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W3Schools is a freemium educational website for learning coding online. [ 1][ 2] Initially released in 1998, it derives its name from the World Wide Web but is not affiliated with the W3 Consortium. [ 3][ 4][unreliable source] W3Schools offers courses covering many aspects of web development. [ 5] W3Schools also publishes free HTML templates.
MySQL. MySQL ( / ˌmaɪˌɛsˌkjuːˈɛl /) [ 5] is an open-source relational database management system (RDBMS). [ 5][ 6] Its name is a combination of "My", the name of co-founder Michael Widenius 's daughter My, [ 7] and "SQL", the acronym for Structured Query Language.
Select (SQL) The SQL SELECT statement returns a result set of rows, from one or more tables. [1] [2] A SELECT statement retrieves zero or more rows from one or more database tables or database views. In most applications, SELECT is the most commonly used data manipulation language (DML) command. As SQL is a declarative programming language ...
SQL syntax. 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. Despite the existence of the standard, SQL code is not completely portable among different database systems without adjustments.
Window function (SQL) In SQL, a window function or analytic function[ 1] is a function which uses values from one or multiple rows to return a value for each row. (This contrasts with an aggregate function, which returns a single value for multiple rows.) Window functions have an OVER clause; any function without an OVER clause is not a window ...
SQL was initially developed at IBM by Donald D. Chamberlin and Raymond F. Boyce after learning about the relational model from Edgar F. Codd [12] in the early 1970s. [13] This version, initially called SEQUEL (Structured English Query Language), was designed to manipulate and retrieve data stored in IBM's original quasirelational database management system, System R, which a group at IBM San ...
MySQLi. The MySQLi Extension ( MySQL Improved) is a relational database driver used in the PHP scripting language to provide an interface with MySQL protocol compatible databases ( MariaDB, MySQL, Percona Server, TiDB ). [ 1][ 2] There are three main API options when considering connecting to a MySQL database server: The PHP code consists of a ...
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. Typically, grouping is used to apply some sort of aggregate function for each group. [ 1][ 2] The result of a query using a GROUP BY statement contains one row for each group.