介绍了两种投影变化及其相关的函数,可以清楚看出这两种变化的差别-introduced two projectors and related changes in the function, it can be clearly seen that the difference between the two changes
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001289s ]
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:0.090487s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001314s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001925s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001235s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003576s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.001262s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.004417s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.015097s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001386s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 316492 [ RunTime:0.001032s ]
