数据库系统概论中所有的数据库例子以及课后习题和最后的上机实习的数据库。薛数据库的兄弟可以看看，有参考价值！-all examples of the database and after-school exercises and the final on the plane internship database. Xue database brothers can see that the reference value!
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.002461s ]
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:0.095383s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.002384s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001959s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.002371s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003640s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.002144s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003338s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.014766s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.002819s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 215996 [ RunTime:0.001195s ]
