堆排序适合于待排序文件中记录较多的情况，因为其主要的时间开销在于建堆和调整堆-HEAPSORT be suitable for sorting paper records more, because the main overhead is the time to build reactors and adjusting the heap
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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:0.103667s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001247s ]
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SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001208s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003589s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.001120s ]
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SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001881s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 172555 [ RunTime:0.001648s ]
