几个MySql的面试题

Which will be faster out of these two queries – one with OR or one with IN?
　　 Where does MyISAM cache table records?
　　 Which will be faster out of queries with explicit INNER JOIN and implicit one?
　　 Is InnoDB faster/better than MyISAM?
　　 Is CHAR faster than VARCHAR?
　　 Is VARCHAR(80) faster than VARCHAR(255)?
　　 Are there performance issues when joining tables from different storage engines?
　　 If I change a derived table to a view, will performance increase?
　　 If I see Using temporary; Using filesort” in the Extra column of EXPLAIN output, does that mean a temporary table is created on disk?
　　 Is it possible to do a FULL OUTER JOIN in MySQL?