Database user scenario with multiple type of user

I am designing a database for a Yii project, the scenario is a user will be ONLY one of the following type: employee, company and business owner person (i.e. the owners who manage companies and employees - super admin - I broke the many to many relationship that's why I call the table "business_owner_person"). Below is how I designed my database in MySQL:

USER

• id,
• username,
• password,
• active

COMPANY

• id,
• name,
• contact_no,
• contact_name,
• address...
• user_id (FK)

EMPLOYEE

• id,
• first_name,
• surname,
• address,
• email...
• company_id (FK)
• user_id (FK)

BUSINESS_OWNER_PERSON

• id,
• name,
• email,
• position...
开发者_Go百科
• user_id (FK)

I am just wondering if there is a better/efficient way to design this scenario so that Yii won't have the problem to fetch the correct additional informations for user.

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It's difficult to make suggestions without knowing a little more about the business, but it seems like you have too much redundant information.

Splitting out the user is good, since any of these types of people can be a user. I would probably put the common information, name, email into the user field, maybe even the address and position.

Then what it looks like you want is that a user can have one or more roles, where the role controls their level of access. This could be as simple, to start out with as a role_id columns in the DB table, or it could be a separate table, user_id, role_id.

Now, all that being said, it's difficult to make suggestions without more information. Do you need to isolate users by company? Will there be a lot of companies? How many business owners are you looking at having?