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You use Microsoft Azure Stream Analytics to analyze website visit logs in real time. You have a table named Locations that has a column containing IP addresses and a column containing country names. You need to look up the country name of a specific IP address. Which query element should you use?
Correct Answer: A
Explanation/Reference: Explanation: Reference data (also known as a lookup table) is a finite data set that is static or slowing changing in nature, used to perform a lookup or to correlate with your data stream. To make use of reference data in your Azure Stream Analytics job, you will generally use a Reference Data Join in your Query. In a usual scenario, we use an event processing engine to compute streaming data with very low latency. In many cases users need to correlate persisted historical data or a slow changing dataset (aka. reference data) with the real-time event stream to make smarter decisions about the system. For example, join my event stream to a static dataset which maps IP Addresses to locations. This is the only JOIN supported in Stream Analytics where a temporal bound is not necessary. References: https://msdn.microsoft.com/en-us/azure/stream-analytics/reference/reference-data-join-azure- stream-analytics
