--- title: Aggregation Type (Term Mapping) description: Aggregation Type sets an aggregate function, or Group By, on the term mapping of a target term. --- [Skip to content](https://knowledge.bigenius-x.com/aggregation-type-term-mapping#main-content) [Contact us](https://knowledge.bigenius-x.com/kb-tickets/new?hsLang=en) [Go to Customer Portal](https://knowledge.bigenius-x.com/customer-portal?hsLang=en) [![TRI\_Logo\_biGENIUS\_2020\_RGB\_s](https://knowledge.bigenius-x.com/hs-fs/hubfs/Marketing/TRI_Logo_biGENIUS_2020_RGB_s.png?width=150&height=42&name=TRI_Logo_biGENIUS_2020_RGB_s.png)](https://www.bigenius-x.com/) Open main navigation Close main navigation - [Contact us](https://knowledge.bigenius-x.com/kb-tickets/new) - [Go to Customer Portal](https://knowledge.bigenius-x.com/customer-portal) How can we help you? - There are no suggestions because the search field is empty. 1. [biGENIUS-X Knowledge Base](https://knowledge.bigenius-x.com/?hsLang=en) 2. [Generators](https://knowledge.bigenius-x.com/generators?hsLang=en) 3. [Properties](https://knowledge.bigenius-x.com/generators?hsLang=en#properties) # Aggregation Type (Term Mapping) **Applies to** Platform: Microsoft SQL Server · Snowflake · Snowflake dbt · Databricks · Databricks dbt · Fabric Lakehouse · Fabric Warehouse · Oracle Aggregation Type sets an aggregate function, or Group By, on the term mapping of a target term. Use it when a dataflow set must deliver one row per group, for example sales per supplier. ### Where to set it Set Aggregation Type when you [edit a term mapping](https://knowledge.bigenius-x.com/edit-a-term-mapping?hsLang=en). ### Values and default - `-` (default): no aggregation. - `Group By`: the term is part of the GROUP BY clause. - `Sum`, `Avg`, `Min`, `Max`, `Count`, `Distinct Count`: the mapped expression is wrapped in that function. - `Expression`: the mapped expression already contains the aggregate function and is used as written. ### Rules - When one term mapping of a dataflow set has an Aggregation Type, every mapped term of that set needs one. See [Dataflow Sets Aggregation Amount (Business Rule)](https://knowledge.bigenius-x.com/dataflow-sets-aggregation-amount-business-rule?hsLang=en). - A dataflow with a multi-version load cannot aggregate. See [Aggregation with multi-version load (Business Rule)](https://knowledge.bigenius-x.com/aggregation-with-multi-version-load-business-rule?hsLang=en). - Mart Dimension and Mart Hierarchy Flatten accept no aggregation. ### Example A Mart Fact on Microsoft SQL Server maps `SALES_AMOUNT` with `Sum`, `REDUCTION_PERCENT` with `Expression` and the foreign key `FK_..._ITEM_ID`, filled from `SUPPLIER_ID`, with `Group By`. The `Expression` of `REDUCTION_PERCENT` is used as written, here with lower-case `sum`. The generated source view, shortened: ``` SELECT CAST([s3].[SUPPLIER_ID] AS DECIMAL(38)) AS [FK_..._ITEM_ID] ,SUM([s1].[SALES_AMOUNT]) AS [SALES_AMOUNT] ,sum([s1].[SALES_AMOUNT]) / (sum([s1].[SALES_PRICE]) * sum([s1].[QUANTITY])) * 100 AS [REDUCTION_PERCENT] FROM ... GROUP BY CAST([s3].[SUPPLIER_ID] AS DECIMAL(38)) ``` ### Related articles - Reference: [Dataflow Sets Aggregation Amount (Business Rule)](https://knowledge.bigenius-x.com/dataflow-sets-aggregation-amount-business-rule?hsLang=en), [Aggregation with multi-version load (Business Rule)](https://knowledge.bigenius-x.com/aggregation-with-multi-version-load-business-rule?hsLang=en) - See also: [Edit a Term Mapping](https://knowledge.bigenius-x.com/edit-a-term-mapping?hsLang=en), [Create a Mart Fact](https://knowledge.bigenius-x.com/create-a-mart-fact?hsLang=en) - [Getting started](https://knowledge.bigenius-x.com/getting-started?hsLang=en#main-content) - [Guidelines](https://knowledge.bigenius-x.com/getting-started?hsLang=en#guidelines) - [Start working](https://knowledge.bigenius-x.com/getting-started?hsLang=en#start-working) - [Account](https://knowledge.bigenius-x.com/getting-started?hsLang=en#account) - [General overview](https://knowledge.bigenius-x.com/general-overview?hsLang=en) - [Artificial Intelligence](https://knowledge.bigenius-x.com/artificial-intelligence?hsLang=en) - 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