除了要指定写到输出文件中的数据格式之外，还必须提供该文件的名称和一个用于指定输出数据的SQLSELECT语句。
Besides specifying the format of the data that is to be written to the output file, you must also provide the name of that file, and an SQL SELECT statement to specify the data that is to be exported.
除了要指定写到输出文件中的数据格式之外，还必须提供该文件的名称和一个用于指定输出数据的SQLSELECT语句。
Besides specifying the format of the data that is to be written to the output file, you must also provide the name of that file, and an SQL SELECT statement to specify the data that is to be exported.
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