OCTETS as a string unit specification does not require any conversion and is more efficient.
OCTETS作为一种字符串单元指定不需要任何转换，而且使用起来更加有效。
Along with the input string, the SUBSTRING function has three other arguments, which are start position, length, and code unit specification.
除了输入字符串之外，SUBSTRING函数还有其他三个参数，它们分别是：起始位置、长度和代码单元指定。
Along with the input string, the SUBSTRING function has three other arguments, which are start position, length, and code unit specification.
除了输入字符串之外，SUBSTRING函数还有其他三个参数，它们分别是：起始位置、长度和代码单元指定。
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