What are the types of relationships used in MySQL?
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网络规划设计师、敏捷专家、CISP、ITSS服务经理、ACA全科目、ACP4项、ACE、CBP、CDSP、CZTP等。拥有 PRINCE2 Foundation/Practitioner、CCSK、ITIL、ISO27001、PMP等多项国际认证。 专利5+、期刊10+、知识产权师。核心期刊审稿人。采纳回答There are three categories of relationships in MySQL:
One-to-One: Usually, when two items have a one-to-one relationship, you just include them as columns in the same table.
One-to-Many: One-to-many (or many-to-one) relationships occur when one row in one table is linked to many rows in another table.
Many-to-Many: In a many-to-many relationship, many rows in one table are linked to many rows in another table. To create this relationship, add a third table containing the same key column from each of the other tables
2021-10-16 17:29:28赞同 1 展开评论 打赏
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