Contents of this chapter contains an important point in understanding the FF model. Please check the following three points, and then proceed to the next chapters.
- A model to store hierarchical data in a database contains two kinds of column. One is "column for storing hierarchical data", and Two is "column for efficiency search".
- A criteria of excellent model for storing hierarchical data in a database, is that it can write a search query to find a subtree and child nodes of an arbitrary node with reference the index.
- An second criteria is that total number of hierarchical structure column and search efficiency columns is fewer.