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数据库系统概论中所有的数据库例子以及课后习题和最后的上机实习的数据库。薛数据库的兄弟可以看看，有参考价值！-all examples of the database and after-school exercises and the final on the plane internship database. Xue database brothers can see that the reference value!

本文所选的符号信源是从键盘上的94个字符中随机抽取，产生50000个随机符号数，包括了大小写字母和一些基本的字符。这些随机数为了方便起见我在网上随机摘抄了几篇英语文摘作为50000个随机产生的符号数以此来统计这些字符出现的概率，统计出概率，信源熵也自然求出，但本文只统计出符号信源出现的概率。-In this paper, the selected source symbol from the keyboard of 94 characters in a random sample, resulting in 50,000 the number of random symbols, including the upper and lower case letters and some basic characters. These random numbers for the sake of convenience I excerpt a few random online English abstracts as 50,000 the number of randomly generated symbols as a means of statistical probability of these characters, the statistics of probability, a natural source of entropy is also obtained, but this article only statistics source symbol probability.