题目：有两个磁盘文件A和B,各存放一行字母，要求把这两个文件中的信息合并（按字母顺序排列）， 输出到一个新文件C中。-topic : There are two disk files A and B, the store his letter, the requirements of these two documents, the information merger (in alphabetical order), the output to a new file C.
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.000961s ]
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:0.183712s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001495s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001995s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001431s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.005401s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.001429s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.005263s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.023163s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001258s ]
UPDATE `jrk_articles` SET `hits` = 2 WHERE `id` = 180387 [ RunTime:0.012993s ]
