pandas.DataFrame.sample随机抽样
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花费 24 ms
Sql中substr的使用
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pd.ExcelWriter(to_excel)保存结果到已存在的excel文件中
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pandas.DataFrame.dropna删除缺失值
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pandas filter数据筛选
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unix_timestamp 时间戳函数用法（hive）
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excel多元回归-系数参数解读
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pandas连接多个表格concat()函数
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pandas.DataFrame.astype数据结构转换
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hive函数 get_json_object
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