老师布置得题目，比较简单，但很实用，用matlab模拟小圆在大圆上滚动的轨迹。-topic, relatively simple, but very useful, using Matlab simulation knolls in the great circle rolling on the track.
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001772s ]
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:0.142871s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001697s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.003231s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001790s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.006134s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.001455s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.005635s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.024229s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001640s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 34657 [ RunTime:0.001326s ]
