如何构建ER图? [英] How to construct ER diagrams ?

问题描述

大家好，

我正在开发一个项目，并且非常简单地进入数据库.例如，我通过按钮插入更新和删除数据.对我来说就是成功.

实际上，我想构建一个更复杂的项目.搜索时，我发现我需要ER图，主键，外键等.

任何人都可以提供有关此信息的任何信息吗?

Hello everyone,

I am developing a project and diving into database very simpler. For example I am inserting updating and deleting data via buttons. That is success for me.

Actually I want to construct a little bit more complex project. When I searched I have seen that I need ER diagrams, primary keys, foreign keys etc.

Could anyone give some information about this ?

推荐答案

查找有关ER图的更多信息的一个很好的起点就像往常一样是Wikepedia:
http://en.wikipedia.org/wiki/Entity%E2%80%93relationship_model [ ^ ]
要创建这样的图，我建议您使用Microsoft Visio.
http://www.sethi.org/classes/cet415/lab_notes/lab_03.html [ ^ ]

A good starting point to find more information about ER Diagrams is as always the Wikepedia:
http://en.wikipedia.org/wiki/Entity%E2%80%93relationship_model[^]
To create such diagrams, I would recommend you to use Microsoft Visio.
http://www.sethi.org/classes/cet415/lab_notes/lab_03.html[^]

创建项目所需的所有表，创建主键并建立关系.所有这些之后，单击Databse图，单击以添加表，然后便有了ER图.

Create all tables required for your project, create primary key and give relationship.After all this, click on Databse diagram, click to add tables and then you have ER Diagram.

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