Data Warehousing: Aggregation (Definitions)

"A table or structure containing pre-calculated data for a cube. Aggregations support rapid and efficient querying of a multidimensional database. " (Microsoft Corporation, "SQL Server 7.0 System Administration Training Kit", 1999)

"A process where the data is presented in a summary form, such as average." (Glenn J Myatt, "Making Sense of Data: A Practical Guide to Exploratory Data Analysis and Data Mining", 2006)

"Summarized values of a measure." (Reed Jacobsen & Stacia Misner, "Microsoft SQL Server 2005 Analysis Services Step by Step", 2006)

"A process where the data is presented in a summary form, such as average." (Glenn J Myatt, "Making Sense of Data: A Practical Guide to Exploratory Data Analysis and Data Mining", 2007)

"Any of a variety of operations that reduces and summarizes large sets of data." (MongoDb, "Glossary", 2008)

"1.Generally, the process of gathering into a whole from parts. 2.In data management, a process that transforms atomic data into aggregate-level information by using an aggregation function such as count, sum, average, standard deviation, etc." (DAMA International, "The DAMA Dictionary of Data Management", 2011)

"A table or structure containing pre-calculated data for an online analytical processing (OLAP) cube. Aggregations support the rapid and efficient querying of a multidimensional database." (Microsoft, "SQL Server 2012 Glossary", 2012)

"A process by which variables are summed based on a classification or temporal hierarchy. Common examples include totaling all sales for a given time period or geographic region." (Evan Stubbs, "Delivering Business Analytics: Practical Guidelines for Best Practice", 2013)

"The sum or collection of data. Often 'aggregation' is used to summarize sales at various levels of the merchandise, location, and time hierarchy." (Brittany Bullard, "Style and Statistics", 2016)

"The act of combining information from separate sources of a lower classification level that results in the creation of information of a higher classification level, which the subject does not have the necessary rights to access." (Shon Harris & Fernando Maymi, "CISSP All-in-One Exam Guide" 8th Ed., 2018)

"Data that’s the result of applying a process to combine data elements. This is data that’s taken collectively or in summary form. Usually, this is a sum, count, or average of underlying detail data." (Sharon Allen & Evan Terry, "Beginning Relational Data Modeling" 2nd Ed., 2005)