这是南京航空航天大学的SQL课件还有作业习题，以及对应的答案。-This is the Nanjing University of Aeronautics and Astronautics, also operating Problem SQL courseware, as well as the corresponding answers.
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Sql Server 南京航空航天大学计算机系 软件工程文档 课堂练习 演示脚本 作业答案 sql server项目 ppt
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.002097s ]
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:0.089826s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.002339s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001842s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.002057s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003670s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.001854s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003157s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.014547s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.002339s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 236833 [ RunTime:0.001432s ]
