使用scott/tiger用户下的emp表完成下列练习，查询，删除增改-Using the scott/tiger user under the emp table to complete the following exercises, query, delete the additions and changes to
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001315s ]
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:0.098317s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001247s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.002014s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001341s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003770s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.001075s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003231s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.015087s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001570s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 243753 [ RunTime:0.001307s ]
