As such you have to explicitly load any tables you need.
因此，你必须明确地加载你所需要的所有表。
Some operations, such as dropping tables or columns, also destroy data.
有些操作（例如删除表或列）也会破坏数据。
Any custom tables that you created, such as emptype.csv.
创建的所有定制表，比如emptype .csv。
John likes to make furniture, such as chairs and tables.
约翰喜欢做家具，如桌子和椅子之类。
John likes to make furniture, such as chairs and tables.
约翰喜欢做家具，如桌子和椅子之类。
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