英文版，为UCSC数据库系统实现课程PPT，教材为Standford“数据库系统实现”-English, in order to achieve curriculum UCSC database system PPT, materials for Standford ‘database system implementation’
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001052s ]
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:0.107647s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001025s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001118s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001174s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003097s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.000984s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003720s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.015832s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001163s ]
UPDATE `jrk_articles` SET `hits` = 2 WHERE `id` = 137652 [ RunTime:0.023916s ]
