为使优化器能够使用可用的分布统计信息，带有具体值的谓词极为重要。

Predicates with concrete values are important for the optimizer to be able to use available distribution statistics.

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如果 IN 列表中包含参数标记符或主机变量，使优化器不能使用编目统计信息来确定选择性，就会出现这种情况。

This can occur if the IN list contains parameter markers or host variables which prevent the optimizer from using catalog statistics to determine the selectivity.

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从建议请求(rfp)和合同到交付，使软件采购和供应商关系最优化。

Optimize software procurement and supplier relationships, from Request for Proposals (RFPs) and contracts to delivery.

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