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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Not an azure solution but check out tools like Q http://harelba.github.io/q/ and LogParser https://www.microsoft.com/en-au/download/details.aspx?id=24659 that let you query CSV as SQL via the command line.
NOTE:
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Hence, a higher number means a more popular project.