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What are the associated models and multi-table queries? What are their relationships?

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What are the associated models and multi-table queries? What are their relationships? What are the associated models and multi-table queries? What are their relationships?

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What are the associated models and multi-table queries? What are their relationships?

The association model is an automatically maintained table-to-table relationship defined in the database, such as association update and association deletion.

Multi-Table query is a multi-Table query. It is completely related to the tables manually controlled by the program. We will maintain it ourselves.

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