流水线作业练习，A、B机器处理作业1～5所需要的时间分别是『。。。。』『。。。。』，一台机器一次只能处理一个作业，一个作业只能由一台机器完成，求A、B完成所有作业的最短时间。-pipeline workbook, A, B machines handling a ~ 5 respectively, the time required is . . . . ]. . . . And one machine can handle only one time operation, an operation only by the completion of a machine, for A, B complete all work is the shortest time.
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001404s ]
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:0.116206s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001511s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001918s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001373s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.005278s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.001423s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.007017s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.020251s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001452s ]
UPDATE `jrk_articles` SET `hits` = 2 WHERE `id` = 321929 [ RunTime:0.023613s ]
