Chapter 5. Scala and SQL through JDBC
One of data science's raison d'être is the difficulty of manipulating large datasets. Much of the data of interest to a company or research group cannot fit conveniently in a single computer's RAM. Storing the data in a way that is easy to query is therefore a complex problem.
Relational databases have been successful at solving the data storage problem. Originally proposed in 1970 (http://www.seas.upenn.edu/~zives/03f/cis550/codd.pdf), the overwhelming majority of databases in active use today are still relational. In that time, the price of RAM per megabyte has decreased by a factor of a hundred million. Similarly, hard drive capacity has increased from tens or hundreds of megabytes to terabytes. It is remarkable ...
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