数据库设计:3种类型的用户，单独的还是一张表?
我有 3 种类型的用户:
I have 3 types of users:
- 管理员
- 供应商
- 员工
每种用户类型将具有不同的用户界面并访问不同类型的数据.他们唯一的相似之处是他们使用的是一个 Web 应用程序，但他们访问的内容完全不同.是将它们全部放在一个用户表中(如 tbl_users)还是创建 tbl_admins、tbl_suppliers、tbl_employees 更好?
Each user type will have different user interface and access different types of data. Their only similarity is they are using one web application but they access totally different things. Is it better to put them all in one user table like tbl_users or is it better to create tbl_admins, tbl_suppliers, tbl_employees?
推荐答案
在设计表格时您需要考虑的不一定是他们可以访问的内容以及它们的相似/不同之处，而是用户如何对自己进行分级相似/不同.
What you need to consider when designing tables is not necessarily what they'll have access to and how that is similar/dissimilar, but rather how the user levels themselves are similar/dissimilar.
例如，如果用户类型将具有相同的属性(姓名、电子邮件、出生日期等)，则它们属于同一个表，并有一列指示其权限级别.
For example, if the user types will have the same attributes (name, email, birthdate, etc), then they belong in one table together with a column indicating their privilege level.
这也有助于更改用户的权限级别，例如，您只需更新用户表中的记录即可将普通员工变成管理员.
This also facilitates changing privilege levels for a user, whereby you can make an ordinary Employee into an Admin, for example, by just updating the record in the user table.
如果供应商是与其他两个不同属性的不同类型的对象，供应商可能属于他们自己的表.
If Suppliers are a different type of object with different attributes than the other two, Suppliers may belong in their own table.
或者，要考虑的另一件事是:您可以使用 users 表，该表仅包含有关所有三种类型的用户的非常有限的信息，并且这些类型是否具有不相关的扩展属性彼此之间，您可以将它们存储在其他表中，并使用外键返回主 users 表.
Or, one more thing to consider: You might use a users table that holds only very limited information about users of all three types, and if the types have extended attributes that don't relate well to one another, you can store those in other tables with a foreign key back to the main users table.
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