Can data used in an application originate only from a relational database?

The assertion that data used in an application can originate only from a relational database is false. Appian is designed to integrate and work with a wide variety of data sources beyond just relational databases. This flexibility allows developers to utilize data from various origins, including but not limited to:

1. APIs: Data can be fetched and manipulated through RESTful or SOAP web services, enabling interaction with external applications and services.

2. External systems: Appian can connect to different types of data stores, including NoSQL databases, flat files, cloud storage, and even legacy systems.

3. In-memory data: Appian applications can involve data loaded into memory during runtime, allowing for efficient processing without relying solely on persistent storage.

By supporting multiple data sources, Appian enables developers to create more dynamic applications that leverage diverse datasets tailored to specific business needs. This broad compatibility ensures that applications can function effectively in various environments and scenarios, making the answer that data can originate from sources other than just relational databases clearly correct.