灰色理论原理，对数学建模解决预测问题很有用的ppt，如有不足，希望大家多多改正！-Gray theory principle of mathematical modeling to solve the issue of prediction useful ppt, is insufficient, I hope everyone a lot to correct!
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001474s ]
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:0.094527s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001261s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001974s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001227s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003573s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.001067s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003197s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.014619s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001769s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 137249 [ RunTime:0.001590s ]
