建表 建索引
CREATE TABLE `vaio` ( `id` int(11) NOT NULL auto_increment,`total` int(11) default 0);ALTER TABLE channel_chaitiao_f4v ADD INDEX index_4(ModifiedDate,Upload)
alter table uchome_blog add index tide(hot,dateline);
添加一个索引,然后再执行刚才的sql,看看执行时间
查询索引 show index from uchome_blog; show keys from uchome_blog;