用二叉树实现逻辑表达式的基本运算,包括逻辑与,或,非,还可以判别表达式是重言式,还是矛盾式.-binary tree using logical expressions of basic operations, including logic and, or, not, we can judge expression is tautology, or contradiction.
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001276s ]
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:0.089634s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001280s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001988s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001606s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.005633s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.001162s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003323s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.014793s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001408s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 190442 [ RunTime:0.004433s ]
