Well i ask it because with some games, it says the sales are 0.00m, and ther are a lot of games with that number.

And there are games that have the japanes sales writen, but not the NA or the EUR sales... why is that?

What that means?

Thank you.

It just means that a lot of our numbers are incomplete because we don't have full access to data.

No, those particular numbers are not "real" in the sense that they don't represent actual sales, most of the time. Can't be helped, though.

If it says 0.00 on a game that has been released... then it just means there is no information on that game regarding it's sales.

Some games will eventually have sales figures added, sometimes just totals or some will have weekly figures extrapolated.... but some (particularly older generation) games will not be possible to update because there is no source of information on them.