With a large character capacity all Chinese characters are covered. Then compression ratio is improved through shortening the encoding length of some frequently used Chinese characters.
在彩色二维条码编解码规则方面,为提高条码的信息压缩比,设计实现多种编码模式,其中汉字库容量已能覆盖所有汉字,并按汉字使用频率进行分组,使出现较频繁的汉字的编码长度较短等方法来提高对汉字的压缩比。
参考来源 - 基于移动终端彩色二维条码编解码算法研究与应用·2,447,543篇论文数据，部分数据来源于NoteExpress
Therefore, if you have the same set of characters in a string, its length may defer according to the encoding used.
因此，如果字符串中有相同的字符集，则其长度可能随使用编码方式的不同而有所不同。
In combination with the data types that use UTF-8 encoding, functions like SUBSTR and LENGTH still work with bytes and not with characters.
在与使用UTF - 8编码的数据类型结合使用时，SUBSTR和LENGTH等函数仍然处理字节而不是字符。
However, in the case of a multi-byte encoding, the length of the character in bytes varies according to the encoding used, and each character can be one or more bytes in length.
但是对于多字节编码，字符的字节长度随使用编码模式的不同而不同，每个字符的长度可能是一个字节或多个字节。
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