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check约束
相关语句
  check constraint
     Then this paper presents the implement of CHECK constraint. CHECK constraint involves Primary key, Not null, unique and Check, among them, Check is the emphases, this paper presents implement of compile and execution about the Check constraint expression, then gives out the system experiment results.
     接着讨论了CHECK约束的实现,CHECK约束包括了Primary key,Not null,unique和Check约束,重点介绍了Check约束,给出了Check约束条件表达式的编译和执行的实现,然后给出了系统运行实验。
短句来源
     This project includes the realization of CHECK constraint and References constraint.
     该方案包括CHECK约束及参照约束的实现。
短句来源
  相似匹配句对
     This project includes the realization of CHECK constraint and References constraint.
     该方案包括CHECK约束及参照约束的实现。
短句来源
     Punishment to the violation of thecontract are three kinds: fine, mortgage on the loan and law restrain.
     法律约束
短句来源
     THEORY OF CONSTRAINTS
     约束理论
短句来源
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  check constraint
A matrix method used to check constraint is proposed, and the coding and decoding representation of the solution are designed, then a new genetic evaluation and select mechanism is proposed.
      
Three parallel channels coupled by an parity-check constraint on the inputs.
      


The realization of GKD-Base is composed of compiling and executing,and the two parts re are independent.The integrity constraint information was adopted from Create table or Alter table statements and stored in data dictionary by the former;the integrity constraint information was taken from data dictionary by the later,then according to the information,the integrity constraint examinations were done while executing DML statement.The index search and memory control were the key technology.This project includes...

The realization of GKD-Base is composed of compiling and executing,and the two parts re are independent.The integrity constraint information was adopted from Create table or Alter table statements and stored in data dictionary by the former;the integrity constraint information was taken from data dictionary by the later,then according to the information,the integrity constraint examinations were done while executing DML statement.The index search and memory control were the key technology.This project includes the realization of CHECK constraint and References constraint.

GKD-Base完整性约束实现方案,分为编译和执行两个独立阶段。前者从CreateTable或AlterTable语句中获取约束的信息并存入数据字典,后者则负责从数据字典中取出约束的信息,再按照这些信息对DML语句进行完整性约束的检查,以判断DML语句的合法性。其关键技术在于索引查找和内存控制。该方案包括CHECK约束及参照约束的实现。

 
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