多元线性回归:输入参数有样本长度（n)，自变量（x）,因变量（Y）-Multiple linear regression: length of input parameters have samples (n), since the variables (x), the dependent variable (Y)
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.012715s ]
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:0.107801s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001706s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001264s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001056s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003355s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.000859s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003844s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.017057s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001102s ]
UPDATE `jrk_articles` SET `hits` = 2 WHERE `id` = 108345 [ RunTime:0.017931s ]
