Java初学者应该认识到的30个问题，我看了后感触颇深，放上来供大家一起参考，学习。-Java for beginners should be aware of the 30 questions, I have deep feelings after reading, Fang Shanglai reference for everyone to learn.
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001153s ]
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:0.084683s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001133s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001858s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001121s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003554s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.000984s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003185s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.014367s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001250s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 45894 [ RunTime:0.001301s ]
