You need the number of games on the database released for the playstation in the 2000’s (2000-2009 inclusive). Look through the schema to find the different tables. You'll need to join the games, gameplatforms, and platforms tables so that you can get the years from the games and the playstation qualifier from the platforms.
SELECT COUNT(*) AS numgames FROM Games g INNER JOIN GamePlatforms gp ON g.gameid = gp.gameid INNER JOIN Platforms p ON gp.platformid = p.platformid WHERE p.platformname = 'PlayStation' AND YEAR(g.releasedate) >= 2000 AND YEAR(g.releasedate) <= 2009;
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