Poll Database Schema

问题

What is the best database schema for polls? Is one-to-many relationship good for this? I'm thinking about having two tables:

poll_questions
    int id
    varchar body
    datetime created_at
    datetime updated_at

poll_answers
    int id
    varchar body
    int votes default 0
    int question_id (foreign key to poll_questions.id)
    datetime created_at
    datetime updated_at

Then there would also be third table for tracking who voted for an answer so users are able to vote only once:

poll_voting_history
    int id
    int question_id (foreign key to poll_questions.id)
    int answer_id (foreign key to poll_answers.id)
    int user_id (foreign key to the id in the users table)
    datetime created_at
    datetime updated_at

What are your thoughts? Am I thinking about it right?

回答1:

The schema looks good, and yes, you'd need to track the user votes as well.

回答2:

Note: the "votes" column of the poll_answers table isn't necessary. Votes can be determined by querying the Poll_voting_history table.

回答3:

I think that question_id in poll_voting_history is not necessary as well, since each answer points to a question, so based on a answer_id you can get the question_id that it belongs to.

回答4:

I would like to add the status of poll_questions and poll_answers as well, just in case if we need to activate or disable the current poll question during given date and time.

来源：https://stackoverflow.com/questions/2264750/poll-database-schema