The use of column groups provides more accurate estimates of the joint selectivity of multiple predicates.
列组的使用将给多个谓词的联合选择提供更准确的估计。
And, as the CEO of F-35 builder Lockheed Martin told Congress, that trillion-dollar estimate is based on a big change in how the Pentagon estimates the Joint Strike Fighter's costs.
作为F - 35的生产商，洛克希德。马丁公司告诉国会，一万亿美元的估计是基于五角大楼对联合打击战机费用预测方法的一次大变化。
And, as the CEO of F-35 builder Lockheed Martin told Congress, that trillion-dollar estimate is based on a big change in how the Pentagon estimates the Joint Strike Fighter's costs.
作为F - 35的生产商，洛克希德。马丁公司告诉国会，一万亿美元的估计是基于五角大楼对联合打击战机费用预测方法的一次大变化。
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