To get the length of each line in the file text, use the length function.
若要获取文件中每行文本的长度，请使用length函数。
The first query employs the LENGTH function.
第一个查询使用length函数。
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 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。
Unlike the LENGTH function, the CHARACTER_LENGTH does not accept input data that is not string based.
与LENGTH函数不同，CHARACTER_LENGTH 只接受基于字符串的输入数据。
Unlike the LENGTH function, the CHARACTER_LENGTH does not accept input data that is not string based.
与LENGTH函数不同，CHARACTER_LENGTH 只接受基于字符串的输入数据。
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