关于内部排序，冒泡、快速等，有很好的计时，交换次数统计，比较各种排序的效率。-With regard to internal sorting, bubble, quick and so on, have a good time to exchange the number of statistics, to compare the efficiency of sorting.
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001230s ]
SELECT `a`.`aid`,`a`.`title`,`a`.`create_time`,`m`.`username` FROM `jrk_downrecords` `a` INNER JOIN `jrk_member` `m` ON `a`.`uid`=`m`.`id` WHERE `a`.`status` = 1 GROUP BY `a`.`aid` ORDER BY `a`.`create_time` DESC LIMIT 10 [ RunTime:0.085949s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001172s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.002097s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001224s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003602s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.000989s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003192s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.014771s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001223s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 148951 [ RunTime:0.001221s ]
