这是Mathematica软件的作者所著的关于Mathematica软件使用最权威，最详尽的教程。-This is a book written by the creator of the software Mathematica, which is definitely authoritative and comprehensive.
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001071s ]
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:0.071098s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001035s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001072s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001078s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003004s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.000904s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003802s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.014142s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001095s ]
UPDATE `jrk_articles` SET `hits` = 2 WHERE `id` = 158297 [ RunTime:0.015406s ]
