DataFrame.notnull() → pyspark.pandas.frame.DataFrame檢測當前 Dataframe 中項目的非缺失值。這個函數接受一個 DataFrame 並指示它的值是否有效(不丟失,在數字數據類型中是NaN,在對象中是None或NaN,在類日期時間中是NaT)。例子:>>> df = ps.DataFrame([(.2, .3), (.0, None), (.6, None), (.2,...
在上面的代码中,我们首先创建了两个DataFrame:main_df和nested_df。然后,我们使用join操作将两个DataFrame连接起来,使用on参数指定连接的列,并使用how='left_anti'参数表示只保留主查询DataFrame中不满足嵌套查询条件的行。最后,我们使用show方法显示结果。 这样,我们就可以在Pyspark DataFrame中编写带有"no...
where子句中与NOT IN或者NOT EXISTS可以使用左反联接写入:
测试的时候发现取出的是一条数据, 因为测试的时候是一天中的两条数据, 没有不同的日期,所以当日以为...
对于我来说,删除Python的应用执行别名帮助:按Windows键(或开始菜单按钮)并键入“应用程序执行别名”在...
One common error that users come across is the “DataFrame object does not support item assignment” error. This error occurs when users try to assign a value to a specific element or column in a DataFrame, which is not supported by the DataFrame object in PySpark. ...
PYTHONspark.createDataFrame([(1)], ["count"]) If we run that code we’ll get the following error message: BASHTraceback (most recent call last): File"<stdin>", line 1,in<module> File"/home/markhneedham/projects/graph-algorithms/spark-2.4.0-bin-hadoop2.7/python/pyspark/sql/session.py...
I'm running a PySpark script in AWS Glue ETL. It is reading from a Postgres database table via a JDBC connection and writing the dataframe to Hudi. This DataFrame contains 7 columns. Three of the columns are type Long, with LogicalType "timestamp-micros". ...
/usr/lib/spark/python/pyspark/sql/session.py in sql(self, sqlQuery, **kwargs) 1032 sqlQuery = formatter.format(sqlQuery, **kwargs) 1033 try: -> 1034 return DataFrame(self._jsparkSession.sql(sqlQuery), self) 1035 finally: 1036 if len(kwargs) > 0: /usr/lib/spark/python/lib/py4j...
保持db_name.table_name用引号括起来(“”)