Overrides default mapping of data types, and the ability to create custom type mappers.
覆盖缺省数据类型映射和创建自定义类型映射程序的功能。
Information such as default value, key and non-key attributes, size and data types is defined in an ASBO.
在ASBO中定义了诸如缺省值、键和非键属性、大小和数据类型之类的信息。
This is, of course, the table of default mapping of data types.
当然，这是默认数据类型映射的表。
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