The example code in Listing 19 creates a distinct user-defined type called "birthday" and is being used as the column type while creating the external table.
清单19中的示例代码创建了一个明显的名为“birthday”的用户定义类型，并在创建外部表时用作列类型。
The example code in Listing 19 creates a distinct user-defined type called "birthday" and is being used as the column type while creating the external table.
清单19中的示例代码创建了一个明显的名为“birthday”的用户定义类型，并在创建外部表时用作列类型。
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