If you have some experience modeling data for relational databases, you know that many-to-many relationships between different relational entities appear all the time.
如果您有关系数据库数据的建模经验，那么您就会知道不同关系实体之间的多对多关系随时会出现。
If you have some experience modeling data for relational databases, you know that many-to-many relationships between different relational entities appear all the time.
如果您有关系数据库数据的建模经验，那么您就会知道不同关系实体之间的多对多关系随时会出现。
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