另一种方法是通过在昵称上定义检查约束来指定分区谓词。
Another alternative is to specify partitioning predicates by defining check constraints on nicknames.
统计视图是一种强大的、新型的统计，它可以表示复杂谓词或表之间的关系。
Statistical views are a powerful new form of statistics that represent relationships among complex predicates or across tables.
基数估计是这样一种过程：在应用了谓词或执行了聚集之后，优化器使用统计信息确定部分查询结果的大小。
Cardinality estimation is a process by which the optimizer USES statistics to determine the size of partial query results after predicates are applied or aggregation is performed.
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