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aggregate function : ウィキペディア英語版
aggregate function
In database management an aggregate function is a function where the values of multiple rows are grouped together as input on certain criteria to form a single value of more significant meaning or measurement such as a set, a bag or a list.
Common aggregate functions include:
*Average() (i.e., arithmetic mean)
*Count()
*Maximum()
*nanmean() (mean ignoring NaN values (or undefined values or 'nil's))
*Median()
*Minimum()
*Mode()
*Sum()
Aggregate functions are common in numerous programming languages, spreadsheets, and relational algebra.
==See also==

*Group by (SQL), SQL clause
*Online analytical processing
*OLAP cube
*Fold (higher-order function)
*Pivot table
*Extract, transform, load
*Data drilling
*Drill down
*Data mining
*Data processing
*Relational algebra
*XML for Analysis
*Cross-tabulation a.k.a. Contingency table
*Utility functions on indivisible goods#Aggregates of utility functions

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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