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:0.001994s ]
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:0.086760s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001890s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.002081s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.002731s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.006485s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.002723s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.006238s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.025845s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.003060s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 303221 [ RunTime:0.001128s ]
