In this video, Patrick shows how to use Power BI and Microsoft Flow to track attendance in the classroom. This is an idea to help spark your imagination for what is possible with Microsoft technologies.
Patrick talks about using expressions in Microsoft Flow. For more information on using expressions, see https://flow.microsoft.com/en-us/blog/use-expressions-in-actions/.
Microsoft Flow uses the same expression language as Azure Logic Apps.
https://docs.microsoft.com/en-us/azure/logic-apps/logic-apps-workflow-definition-language