In fact, SQL Server outnumbers both of these database vendors in installed sites globally. Microsoft SQL Server has arrived!

These provide some of the things that SQL-based relational databases do but are tuned heavily for handling the demands of big data. VoltDB falls into this category: it's a high-speed SQL database.

How will SQL Database Edge connect back to Azure/on-premises? Azure SQL Database Edge has a streaming engine which is built on top of Azure Stream Analytics.

For example, Apache Cassandra, a wide column store, has its own SQL-like language, the Cassandra Query Language or CQL. Some of the CQL syntax is straight out of the SQL playbook, like the SELECT ...