建立二叉树，统计二叉树中度为2的结点个数和叶子结点个数（ 用递归或非递归的方法都可以，先序、中序或后序均可）-establish binary tree, Statistics for the two binary tree to moderate the number of nodes and the number of nodes leaves (with the recursive and non- recursive method can be first order, After the order or sequence may)
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001919s ]
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:0.086697s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.002170s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.002021s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.002096s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003527s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.001955s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003187s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.014183s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.002207s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 164603 [ RunTime:0.001053s ]
