Select the Truncate table action to delete all the existing rows in the Orders table before the data load operation starts.

在数据加载操作开始之前，选择truncate表操作删除orders表中的所有已有行。

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Each operation on a file handle-open, read, write, rewind, truncate, and close, for example-affects the state of the file.

文件句柄上的每个操作(例如open、read、write、rewind、truncate和close)影响文件的状态。

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Additionally, there cannot be a foreign key constraint between the table being truncated and other tables, otherwise the truncate table operation fails.

此外，被truncate的表和其他表之间是不能有外键约束的，否则truncateTABLE操作会失败。

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Additionally, there cannot be a foreign key constraint between the table being truncated and other tables, otherwise the truncate table operation fails.

此外，被truncate的表和其他表之间是不能有外键约束的，否则truncateTABLE操作会失败。

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