marked null

 
  • 带标记空值

marked null的用法和样例:

例句

  1. 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。
  2. The clerk marked up his daybook before going home.
    办事员在回家前记好当天的日记帐。
  3. The road we should take is marked on the map.
    我们要走的路已经标在地图上了。
  4. The state or quality of being null.
    无效无效的状况或性质
  5. 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。
  6. They marked the boundaries of the football fields.
    他们画出了足球场地的边界。
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