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?