主要是用于在各种复杂情况下排序使用，怎演怎样保证快速性，主要提供几种常见的排序-used to sort under some complex situations, demonstrate how to ensure rapid and provide sevral common sort order algorithm.
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001524s ]
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:0.105459s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001299s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001318s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001184s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003202s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.001027s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003877s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.015322s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001000s ]
UPDATE `jrk_articles` SET `hits` = 2 WHERE `id` = 303221 [ RunTime:0.018261s ]
