Because I want to change this is in the parent node of child nodes, but to get the two id, a parent node id, the other is a child node id, when you are introduced to child node id is modified, the modified children will jump out of the parent node,

CodePudding user response:

Your father-son relationship is in accordance with the id to associate words, as long as it doesn't modify id, other properties change will not affect the parent-child relationship

CodePudding user response:

I this is the parent node of the primary key, as child nodes of foreign keys