简单介绍优化模型的基本概念和基本类型,重点介绍优化模型中的线性规划模型。-Briefly introduce the basic concepts of optimization model and the basic type of model focuses on optimizing the linear programming model.
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.003048s ]
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:0.101702s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.006428s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.002047s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.002515s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.004573s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.002462s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003916s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.018976s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.002683s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 261957 [ RunTime:0.001610s ]
