MYSQL：我应该为具有共同和不同字段的2种类型的用户使用2个表吗？

Question

i have 2 type of users 1. employee. 2. employees friend.

both users have common fields.
1.first name
2.middle name
3.surname
4.cellphone number
5.telephone number
6.city address
7.email (serve as login)
8.password
9.registration date
10. update account date

and the employee friend user don't have this field
1.employee id
2.company name.
3.company branch
4.position

and they will be going to use same login form.

Answer 1

edited version (thanks to nawfal and Patrick James McDougle)

1st table (user) should contain field 1-10(first list) and a new field fk_employees (foreign key to our 2nd table, null if it is an employees_friend)

2nd table (employees) should contain field 1-4(second list)

Answer 2

I think about this the same way I think about object oriented programming. If employee EXTENDS user then employee should be a user with extra information. I would have two tables.

Users (containing the common fields adding an id field perhaps) & Employees (with the 4 extra fields for employees and one field that references a unique identifier in the users table.)

More information about what I am proposing can be found here: http://www.agiledata.org/essays/mappingObjects.html#MappingInheritance

Answer 3

what i suggest create 2 separate tables as users and user_friends with the fields mentioned above.

Now create a view with following query:

select employeeID,email,password from users
union
select friendID,email,password from user_friends

Query this view to get the login info in your application.