日期是日期时间的数据帧:
Column | Date
:-----------|----------------------:
A | 2018-08-05 17:06:01
A | 2018-08-05 17:06:02
A | 2018-08-05 17:06:03
B | 2018-08-05 17:06:07
B | 2018-08-05 17:06:09
B | 2018-08-05 17:06:11
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返回表是;
Column | Date
:-----------|----------------------:
A | 2018-08-05 17:06:02
B | 2018-08-05 17:06:09
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