电子邮件发件人在PHP / MySQL中

Question

I am trying to build an email sender in PHP/MySQL where you can choose the group of people (in dropdown menu) and send them a message. I have a {users} table with emails and I am having trouble figuring out how to do groups table.

What columns should I have? or Any other way to do the same thing?

I would be really grateful if you could explain like you would to a beginner :)

Thank you)

Answer 1

You're looking for a many-to-many relationship, which will look something like this (three tables):

group

id
name

user_groups

id
user_id
group_id

users

id
name
email

Whenever a user is added to a group, you will insert a row into the user_groups table.

Have a read on Database Normalization.