Database Last updated Save as PDF OverviewGot questions about Database with OutSystems? We have answers:Data ModelingQuery DataConnect to an External DatabaseFeaturedBootstrap an Entity Using an Excel FileBootstrap an Entity Using an Excel FileExcelファイルを使用してエンティティをブートストラップする Tools and ResourcesForge Data connectors TrainingLearn OutSystems and amaze your colleagues with your ninja mobile app skills:Course: Developing OutSystems Mobile AppsCourse: Developing OutSystems Web ApplicationsMaster Class on Best Practices and Timers SupportJust for you, here are the answers to the support questions we get asked the most. Best PracticesHone those ninja skills with some helpful hints and tips. DocumentationGo deep into the weeds of OutSystems apps so you're prepared for anythingDatabase IndexesCreate an Entity IndexData TypesEntity RelationshipsData ModelingShow more Create a Calculated Attribute in an AggregateDbCleaner APIHow Data Model Changes are HandledCreate and Use an EnumerateCreate a One-to-One RelationshipCreate a One-to-Many RelationshipIntegrate with an External DatabaseCreate a Many-to-Many RelationshipCreate an Entity to Persist DataHandling Transactions Still need help?We’re real people. And we’re here to help you.Ask the CommunityReach out to our experts and you could get an answer in less time than it takes to swim 50 laps..Open a Support CaseThe best way to get support, we ensure your issue will reach the right experts, as fast as possible.