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- This paper deals with the semantics of null values in functional dependencies in database theory, and presents three different definitions of FDs in a single relation with marked nulls. 本文研究关系数据库理论中空值在函数依赖中的语义问题,提出了带标志空值的关系中函数依赖的三种定义。
- The clerk marked up his daybook before going home. 办事员在回家前记好当天的日记帐。
- The road we should take is marked on the map. 我们要走的路已经标在地图上了。
- The state or quality of being null. 无效无效的状况或性质
- Mr Powel has marked out a general course of action. 鲍威尔先生已经拟定了一个总的行动计划。
- They marked the boundaries of the football fields. 他们画出了足球场地的边界。
- The date marked on the marble has been filed away. 刻在大理石上的日期已被磨掉了。
- The act of making null and void. 废除使 ... 作废和无效
- He vainly tried to mark the defacing stain out. 他试图除去有损外观的污迹，但没有成功。
- Einstein's theory marked a new epoch in physics. 爱因斯坦理论开创了物理学的新纪元。
- The place is marked on the map with a crossing. 那个地方在地图上以十字形记号标出。
- A flourish of trumpets marked the Queen's arrival. 小号奏出嘹亮的乐曲欢迎女王驾到。
- A pyramid of stones marked the spot. 那地点用一堆堆成金字塔形状的石头作了标记。
- Her ability marked her out for political success. 她的才能表明她必能在政治上取得成就。
- The dividing line is not always marked and clear. (两者间的)界限并不总是那么清楚明显的。
- The contract was null and void because it was not signed. 这个合同无效，因为它尚未签字。
- Marked by striking audacity or verve. 过人勇气的或精力旺盛的
- The court ruled that the claim was null and void. 法庭裁决此项要求无效。
- My floor is all marked up with their muddy boots. 我的地板全让他们那些沾满污泥的长筒靴弄脏了。
- The store has marked its summer dresses down. 商店把夏委服装都减价了。
