Integrity in this case means consistency with the generated column specification.
本例中的完整性是指与生成列规范的一致性。
Using the CREATE EXTERNAL TABLE statement with column specification (see Listing 1).
使用带有列指定的CREATE EXTERNAL table语句(参见清单1)。
Creation of external tables also includes a USING clause in addition to the column specification.
除列指定之外，外部表的创建还包含一个using子句。
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