介绍用Java计算以下几种统计值的方法:平均数,中位数,众数,标准方差,回归方程式,相关系数.-introduced Java calculated value of the following types of statistical methods : the average, median, mode, standard deviation, the regression equation, the correlation coefficient.
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001343s ]
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:0.103721s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001234s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001908s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001227s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003791s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.001049s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003204s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.016825s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001406s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 43116 [ RunTime:0.004017s ]
