--- title: Hash Concatenation Separator (Project) description: Hash Concatenation Separator (HashConcatenationSeparator) is the text that the generated loaders put between the term values of a hash input. --- [Skip to content](https://knowledge.bigenius-x.com/hash-concatenation-separator-project#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) # Hash Concatenation Separator (Project) **Applies to** Platform: Microsoft SQL Server · Snowflake · Snowflake dbt · Databricks · Databricks dbt · Fabric Lakehouse · Fabric Warehouse · Oracle Architecture: Data Store · Data Vault · Dimensional · Data Mart Hash Concatenation Separator (`HashConcatenationSeparator`) is the text that the generated loaders put between the term values of a hash input. It applies to every key hash and row hash of the project. Set it in Project Settings before the first load. ### Values and default - Format: free text on one line. - Default: `_` (underscore). - Level: project, in the Hashing group of the Additional Settings in Project Settings. The separator stands only between two values, never at the start or the end. A hash over a single term, such as the Hub\_HK of a Hub with one business key, therefore does not contain it. ### Effect on generated output The separator appears as a string literal between the prepared term values. With the value `|`, Microsoft SQL Server generates: ``` ISNULL([CUSTOMER], N'_NULL_') + N'|' + ISNULL([CUSTOMER_TYPE], N'_NULL_') ``` Oracle generates `NVL(CUSTOMER, '_NULL_') || '|' || NVL(CUSTOMER_TYPE, '_NULL_')`, and Databricks dbt passes the value to `CONCAT_WS`. A value that contains the separator can give the same input text as other values, for example the term values `x_y` and `z` in one row and `x` and `y_z` in another, which both give `x_y_z` with the default. Both rows then get the same hash. How the input is built is explained in [How biGENIUS-X builds hash values](https://knowledge.bigenius-x.com/how-bigenius-x-builds-hash-values?hsLang=en). ### Changing the value A new separator changes every hash with two or more inputs. Stored hash values are not recalculated, so the next load treats the affected rows as changed and writes new versions. The consequences for loaded objects are described in [Changing the hash settings](https://knowledge.bigenius-x.com/how-bigenius-x-builds-hash-values?hsLang=en#changing-the-hash-settings). Available since Generator 2.2. Earlier releases always used `_`, so the default keeps hash values unchanged after an upgrade. ### Related articles - Reference: [Hash Null Placeholder (Project)](https://knowledge.bigenius-x.com/hash-null-placeholder-project?hsLang=en), [Hash Casing (Project)](https://knowledge.bigenius-x.com/hash-casing-project?hsLang=en), [Hash Trim (Project)](https://knowledge.bigenius-x.com/hash-trim-project?hsLang=en), [Hash Algorithm (Project)](https://knowledge.bigenius-x.com/hash-algorithm-project?hsLang=en) - See also: [How biGENIUS-X builds hash values](https://knowledge.bigenius-x.com/how-bigenius-x-builds-hash-values?hsLang=en), [Manage Project settings and Generator configuration](https://knowledge.bigenius-x.com/manage-project-settings-and-generator-configuration?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) - 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