Question 113 of 170 from exam DP-200: Implementing an Azure Data Solution

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Question

HOTSPOT -

You are building an Azure Stream Analytics query that will receive input data from Azure IoT Hub and write the results to Azure Blob storage.

You need to calculate the difference in readings per sensor per hour.

How should you complete the query? To answer, select the appropriate options in the answer area.

NOTE: Each correct selection is worth one point.

Hot Area:

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Explanations

Box 1: LAG -

The LAG analytic operator allows one to look up a previous event in an event stream, within certain constraints. It is very useful for computing the rate of growth of a variable, detecting when a variable crosses a threshold, or when a condition starts or stops being true.

Box 2: LIMIT DURATION -

Example: Compute the rate of growth, per sensor:

SELECT sensorId,

growth = reading -

LAG(reading) OVER (PARTITION BY sensorId LIMIT DURATION(hour, 1))

FROM input -

https://docs.microsoft.com/en-us/stream-analytics-query/lag-azure-stream-analytics

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