数据库实验报告，老师布置的作业，也就是课本上的题自己用SQL语言进行调试，编写。-experimental database report, the teacher layout of the operation, which is on the books and that their use SQL debugging and preparation.
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001855s ]
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:0.079481s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001034s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001171s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001419s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003528s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.001286s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.004035s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.015684s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001154s ]
UPDATE `jrk_articles` SET `hits` = 2 WHERE `id` = 294272 [ RunTime:0.021170s ]
