2第二章，主要介绍使用常用的MATLAB命令来处理数据，所提供的代码已经在基于MATLAB7.01环境下编程通过。-the chapter two is only designed for those who use commands in Matlab and tell u how to use these commands.
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001234s ]
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:0.088240s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001271s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.003276s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001845s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.006361s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.001595s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.005967s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.025018s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001932s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 33233 [ RunTime:0.001806s ]
