核电工程材料数据库内数据关系模式的规范化

The Standardization of Data Relational Mode in the Material Database for Nuclear Power Engineering

关系型数据库要求数据关系是规范化的，核电工程材料数据库的数据关系包含层次结构和重复组记录，采用定义编码规则，建立代码库，在零件和材料，材料和材料性能之间建立关系库，消除非规范化的数据关系，使所有关系模式都达到第三范式的要求．

Relational database demands the data relation is standard.The data relation includes hierarchical structure and repeat set record.Code database is created and the relational database is created between spare parts and material and properties of material.Get rid of the data relation which is not standard and make all relation modes meet the demands of the 3NF(Third Norm Form).