group-by - определение. Что такое group-by
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Что (кто) такое group-by - определение

SQL KEYWORD
GROUP BY (SQL); GROUP BY; Group by

Group by (SQL)         
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.
Free-by-cyclic group         
Free by cyclic; Free by cyclic group
In group theory, especially, in geometric group theory, the class of free-by-cyclic groups have been deeply studied as important examples. A group G is said to be free-by-cyclic if it has a free normal subgroup F such that the quotient group G/F is cyclic.
Group (military unit)         
GENERIC MILITARY UNIT SIZE DESIGNATION
Group (air force unit); Air group; Air force group; Group (air force); Groupe; Group (military aviation unit); Group (British Army)
A group is a military unit or a military formation that is most often associated with military aviation.

Википедия

Group by (SQL)

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.

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 per group. This includes columns that appear in the GROUP BY clause as well as aggregates resulting in one value per group.

Примеры употребления для group-by
1. Police had arrested 11 of the group by late yesterday.
2. Hamas, deemed a terrorist group by the United States, could easily win, they warned.
3. It is listed as a terror group by the United States, EU and India.
4. With Kia, it is the world‘s No. 7 car–making group by sales.
5. It is classified as a terrorist group by the European Union and the United States.