摘要：
添加注释和取消的区别，F5查看效果，执行时间对比强制执行索引范例SELECT COUNT(1) FROM (select * from vav_stbms_tb_act_source_2012 where cstart_time >= to_date('2011/11/1 02:00:00', 'yyyy/mm/dd hh24:MI:ss') and cstart_time < to_date('2011/11/2 02:00:00', 'yyyy/mm/dd hh24:MI:ss'... 阅读全文
