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ER图：实体→属性→属性

[英]ER diagram: entity → attribute → attribute

原文 2017-12-06 11:12:12 0 1 sql/ entity-relationship

I have to create a ER diagram for this situation:我必须为这种情况创建一个 ER 图：

There are some houses (with own ID) and each house has some attributes like the position of the house and the price.有一些房子（有自己的ID），每个房子都有一些属性，比如房子的位置和价格。 The position has a valuation like the price and I have a list of evaluation.该职位的估值与价格类似，我有一份评估清单。

I have create an entity for the houses with the position attribute and the price attribute but I'm not able to link the position and the price attribute with own valuation.我已经为具有位置属性和价格属性的房屋创建了一个实体，但我无法将位置和价格属性与自己的估值联系起来。

The schema is this:架构是这样的：

Have you some idea to solve it, without to delete the list possibile valuation entity?您有什么想法可以解决它，而无需删除list possibile valuation实体？ Thank you very much!非常感谢你！

I wish to maintain the information house in an unique entity and the evaluation in another entity.我希望在一个独特的实体中维护信息库，并在另一个实体中维护评估。 Because my goal is to have one table for all the evaluation因为我的目标是一张桌子来做所有的评价

1 个解决方案

Why don't you create a one-to-many relationship?为什么不创建一对多关系？ This way, you would have the valuation ID in house's table, and both entities will remain in separated tables.这样，您将在 house 的表中拥有估值 ID，并且两个实体将保留在单独的表中。

There's a good example in this link .这个链接中有一个很好的例子。