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。
When you call this function, all incoming byte streams are written to a file.
调用该函数时，所有进入的字节流已被写入到文件。
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。
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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