September 2017
Beginner to intermediate
412 pages
8h 55m
English
Content preview from Java Data Analysis
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SQL versus NoSQL
Databases are generalized data structures. Both store data, either internally in memory or externally on disk or in the cloud. As data containers, they have a logical structure and a physical structure.
Consider the simplest of data structures: a one-dimensional array a[] of strings. The logical structure of this is shown in Figure 10-2.
Figure 10-2. An array of strings
It is an object, referenced by the variable a. Inside that object is a sequence of numbered storage compartments, each capable of holding a string object.
However, the physical structure, hidden from the programmer, is a sequence of bytes in memory. Using two-byte Unicode ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.