Rating System in PHP and MySQL

Question

If we look at the stackoverflow website we have votes. But the question is what is the bestway to store who has voted and who has not. Lets also simplify this even more and say

Answer 1

I believe your design won't be able to scale for large numbers of voters. The typical thing to do is to create to tables

Table 1: question - Id(INT) | userId(INT) | title(TEXT)
Table 2: question - ID(INT) | vote(INT) | ratedBy(TEXT)

Then you can count the votes with a query like this:

SELECT t1.question_Id, t1.userId, t1.title, t2.sum(vote)
FROM table1 t1
LEFT JOIN table2 t2 ON t1.question_id = t2.question_id