You can drill down multiple levels in a query to specify nested predicates, clauses, and expressions.
您可以在一个查询中钻取多层，以指定嵌套的谓词、子句和表达式。
Predicates that are pushed down to a nested table expression or materialized view without changing the result, and not already done automatically by DB2.
下推到嵌套表表达式或物化视图而不会改变结果，并且不是由 DB2 自动完成的谓词。
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