ID3决策树内容简介：
概述
预备知识
决策树生成(Building Decision Tree)
决策树剪枝(Pruning Decision Tree)
捕捉变化数据的挖掘方法
小结
-ID3 Decision Tree Description: an overview of prior knowledge to generate decision tree (Building Decision Tree) decision tree pruning (Pruning Decision Tree) to capture changes in data mining methods Summary
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001653s ]
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:0.108169s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.004886s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001216s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001027s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003094s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.001016s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003648s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.019071s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001225s ]
UPDATE `jrk_articles` SET `hits` = 2 WHERE `id` = 316488 [ RunTime:0.017971s ]
