1、1+1/2+1/3+……+1/n
2、键盘输入任何数字，求其阶乘
3、数组输入和输出
4、求数组的max和min
-1,1+1/2+1/3+ ... ...+1/n 2, keyboard input any number, find its factorial 3, an array of input and output 4, seeking an array of max and min
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001245s ]
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:0.094272s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001195s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001909s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001212s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003608s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.001060s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003266s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.016110s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001323s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 298374 [ RunTime:0.001468s ]
