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Using a Domain allows you to create a virtual view that is made and stored in the server without modifying the original data source. Databases typically contain data in tables that are optimized for storage and retrieval. In order to be rendered for presentation, columns with data relevant to users need to be joined across several tables, filtered by business needs, secured against unauthorized access, and labelled using user-friendly names. In relational databases, a view can perform some of these functions. In the server, a Domain performs all of these functions, and more (such as the localization of report text and permissions based on data values).
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