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You cannot alter the external table schema.
不能改变外部表模式。
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To compare, create an external table with NUMROWS
为了进行比较，创建一个带有 NUMROWS 的外部表
Create an external table using the following DDL.
使用以下ddl创建一个外部表。
The report produced a table which was said to provide "some slight support for the belief that external appointees on the whole perform less well than internal recruits".
BBC: Do you need a copper to inspect the cops?
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