DurationLabel：如果分区键列的数据类型是日期、时间或时间戳，这个参数指定与Constan t值相关的时间单位。
DurationLabel: Identifies the duration that is associated with the Constant value specified if the partitioning key column has been assigned a date, time, or time stamp data type.
当使用 VARCHAR 或 VARGRAPHIC 数据类型时，索引键限制可能减少。
The index key limit might be reduced when you are using VARCHAR or VARGRAPHIC data type.
键并不限制为整数；它可以是任何不易变的数据类型，包括 integer、float、tuple 或 string。
The key isn't restricted to being an integer; it can be any nonmutable data type, including an integer, float, tuple, or string.
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