er图中有三个实体具有多个相同的属性怎么画
可以在ER图中重复这些实体，并在每个实体上标记相同的属性。或者，可以创建一个具有这些属性的新实体，并将其与原始实体相关联。这取决于具体情况和数据模型的需求。
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