[SQL]optimal not in performance

若使用not in 的效能很差
可以改用minus可以提升效能

http://dbaforums.org/oracle/index.php?showtopic=21583

http://www.dba-oracle.com/oracle_news/2005_3_31_tips_using_not_exists_minus_sql.htm

http://www.dba-oracle.com/t_cbo_existence_queries.htm