归并排序：将数组划分为小数组,通过局部的有序合并,解决问题
算法平均时间复杂度: O(nlogn)
-Merging Sort: The array is divided into a small array, in an orderly manner through the partial merger, the average time algorithm to solve the problem complexity: O (nlogn)
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001359s ]
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:0.089531s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001243s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.002034s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001259s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003869s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.001064s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003587s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.015909s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001436s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 142113 [ RunTime:0.001634s ]
