The Stream Analytics query language allows to perform CEP (Complex Event Processing) by offering a wide array of functions for analyzing streaming data. This query language supports simple data manipulation, aggregation and analytics functions, geospatial functions, pattern matching and anomaly detection. You can edit queries in the portal or using our development tools, and test them using sample data that is extracted from a live stream.
Note: Stream Analytics is a cost-effective event processing engine that helps uncover real-time insights from devices, sensors, infrastructure, applications and data quickly and easily.
Monitor and manage Stream Analytics resources with Azure PowerShell cmdlets and powershell scripting that execute basic Stream Analytics tasks.
Reference:
https://cloudblogs.microsoft.com/sqlserver/2014/10/29/microsoft-adds-iot-streaming-analytics-data-production-and-workflow-services-to-azure/
https://docs.microsoft.com/en-us/azure/stream-analytics/stream-analytics-introduction