It is similar to the LENGTH function when used against a single-byte data type.

它与对单字节数据类型使用LENGTH函数类似。

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It gives double the LENGTH function value if double-byte data type is used as input.

如果使用双字节数据类型作为输入，它就会给出双倍的length函数值。

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The unsigned char data type, and byte data type will yield incorrect results and act as though they are signed types i. e. type char.

无符号字符数据类型和二进制数据类型将产生错误的计算结果，会当成有符号的数据类型进行计算。

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