如 SQL 标准中所述，此函数返回输入字符串的八位字节长度或字节长度。

This function, as mentioned in SQL standard, returns the length of the input string in octets or bytes.

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所有的计算机都基于八位字节。

All computers are based on the eight-bit byte.

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第一个字节定义后面紧跟的八位元数，如果是7f或更小，这就是等价的ascii值。

The first byte defines the number of octets to follow, or if it is 7f or less, it is the value of an ASCII equivalent.

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