May 2020
Beginner
564 pages
14h 9m
English
Content preview from Learn SQL Database Programming
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Tables
In an RDMS, objects called tables store data. Tables are a collection of related data stored in columns and rows. The following screenshot is a cross-section of a table that contains data about baseball players' appearances in all-star games:
A NULL value in a table is a value that appears to be blank. It doesn't represent a string of blank spaces, zero, or a zero-length character string: it's a missing or unknown value.
The data has been sourced from http://www.seanlahman.com/baseball-archive/statistics/ with a CC BY-SA 3.0 license.
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