不过，即使是完全准确的计算，其结果与天王星的实际运行轨迹也并不完全一致。
Notwithstanding, all nicety of calculations, the real course of Uranus would not at all agree with the one computed.
通过在DDL中确保数据类型一致，在查询运行当中与数据转换相关的开销会比较小。
By making data types consistent within the DDL, there is less overhead associated with conversion of data at query run time.
使用与运行数据一致的快照。
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