糊涂先生给他的五个朋友写信,他写了五封信,但是当他的朋友收到信后,都告诉他:“你的信寄错了”。那么请你计算一下:出现这种情况的概率有多少?(假设糊涂先生是随机地往信封里装信的),你能不能把所有的情况都列出来呢-Mr. foolish to write him five friends, he wrote five letters, but when his friend received a letter, told him:
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001499s ]
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:0.098846s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001336s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001949s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001245s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003793s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.001046s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003233s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.019649s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001749s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 178071 [ RunTime:0.001520s ]