对一个产生的离散序列作傅立叶变换，分析其频率响应特性（给出幅频与相频特性曲线）-A discrete sequence generated for the Fourier transform to analyze the frequency response characteristics (frequency and amplitude given phase frequency response curve)
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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:0.073663s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.000950s ]
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SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.000973s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003326s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.000906s ]
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SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001172s ]
UPDATE `jrk_articles` SET `hits` = 2 WHERE `id` = 338817 [ RunTime:0.018507s ]
