We firstly analyze the direct dependence, union dependence and extendedly union dependence.Then, we propose solutions for the dependence based on bits schema decomposition and meta-relation.

• 在对直接依赖、组合依赖和扩展组合依赖分析的基础上，就这三种依赖关系提出了码位模式分解和基于元关系的解决方法。