不用介绍了吧，离散数学的玩意，求真值表，用C++编程序实现的，可以学习一下哦。
-Do not have introduced it, Discrete Mathematics thing, and truth table, using C++ Programmed to achieve, can learn about Oh.
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001302s ]
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:0.092849s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001592s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.002739s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001318s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003632s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.001132s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003244s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.016553s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001372s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 89912 [ RunTime:0.001084s ]
