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  2. Group by (SQL) - Wikipedia

    en.wikipedia.org/wiki/Group_by_(SQL)

    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. This implies constraints on the columns that can appear in the associated SELECT clause. As a general rule, the SELECT clause may only contain columns with a unique value ...

  3. Grouped data - Wikipedia

    en.wikipedia.org/wiki/Grouped_data

    Another method of grouping the data is to use some qualitative characteristics instead of numerical intervals. For example, suppose in the above example, there are three types of students: 1) Below normal, if the response time is 5 to 14 seconds, 2) normal if it is between 15 and 24 seconds, and 3) above normal if it is 25 seconds or more, then the grouped data looks like:

  4. MySQL AB - Wikipedia

    en.wikipedia.org/wiki/MySQL_AB

    MySQL AB had 400 employees in 25 countries, [2] and Open-source model companies. Around 70% of the employees were remote workers. [3] Together with Linux, Apache, and PHP, the MySQL Server forms one of the building blocks of the LAMP technology stack. The company claimed over 5 million MySQL installations and over 10 million product downloads ...

  5. Percona Server for MySQL - Wikipedia

    en.wikipedia.org/wiki/Percona_Server_for_MySQL

    Percona Server for MySQL is an open source relational database management system (RDBMS). It is a free, fully compatible drop in replacement for Oracle MySQL . The software includes a number of scalability, availability, security and backup features only available in MySQL's commercial Enterprise edition. [ 2 ]

  6. Normal form for free groups and free product of groups

    en.wikipedia.org/wiki/Normal_form_for_free...

    A free group has a unique normal form i.e. each element in is represented by a unique reduced word. Proof. An elementary transformation of a word w ∈ G {\displaystyle w\in G} consists of inserting or deleting a part of the form a a − 1 {\displaystyle aa^{-1}} with a ∈ S ± {\displaystyle a\in S^{\pm }} .

  7. LAMP (software bundle) - Wikipedia

    en.wikipedia.org/wiki/LAMP_(software_bundle)

    MySQL is a multithreaded, multi-user, SQL database management system, [9] acquired by Sun Microsystems in 2008, which was then acquired by Oracle Corporation in 2010. [10] Since its early years, the MySQL team has made its source code available under the terms of the GNU General Public License , as well as under a variety of proprietary agreements.

  8. List of column-oriented DBMSes - Wikipedia

    en.wikipedia.org/wiki/List_of_column-oriented_DBMSes

    1 Free and open-source software (FOSS) 2 Platform as a Service (PaaS) 3 Proprietary. ... This article is a list of column-oriented database management system software.

  9. Group code - Wikipedia

    en.wikipedia.org/wiki/Group_code

    In coding theory, group codes are a type of code. Group codes consist of n {\displaystyle n} linear block codes which are subgroups of G n {\displaystyle G^{n}} , where G {\displaystyle G} is a finite Abelian group .