ASA Query Language
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ASA Query Language
ASA Query Language is a SQL-like language used in Azure Stream Analytics (ASA) to process real-time streaming data. It enables users to write queries that filter, transform, aggregate, and join streaming data coming from inputs like Azure Event Hubs, IoT Hub, or Blob Storage.
The language supports SELECT-FROM-WHERE syntax similar to SQL but adds features specific to time-based and streaming operations. It handles both windowing functions (like tumbling, hopping, and sliding windows) and temporal joins, making it ideal for real-time analytics.
Key Features:
Windowing Functions: Analyze data over time windows.
TUMBLINGWINDOW for fixed windows
HOPPINGWINDOW for overlapping windows
SLIDINGWINDOW for event-driven scenarios
Aggregations: Perform COUNT, SUM, AVG, MAX, etc., within time windows.
Joins: Join streams or reference data using JOIN ON with time constraints.
User-Defined Functions (UDFs): Custom logic in JavaScript.
Pattern Matching: Detect trends or anomalies in data streams.
Example Query:
sql
Copy
Edit
SELECT
DeviceId,
AVG(Temperature) AS AvgTemp
FROM InputStream
GROUP BY TumblingWindow(minute, 5), DeviceId
Use Cases:
IoT telemetry processing
Fraud detection
Clickstream analysis
Real-time dashboards
ASA Query Language makes it easy to extract insights from continuous data streams without writing complex code, leveraging the familiarity of SQL with real-time power.
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