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求和符号∑的性质与应用

∑ 是一个求和符号，英语名称：Sigma，汉语名称：西格玛（大写Σ，小写σ）

基本文件流程错误 SQL 调试

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CONNECT:[ UseTime:0.003081s ] mysql:host=127.0.0.1;port=3306;dbname=dimhok;charset=utf8
SHOW FULL COLUMNS FROM `edu_coursetype` [ RunTime:0.004095s ]
SELECT * FROM `edu_coursetype` WHERE ( parent=0 ) ORDER BY `listorder` ASC [ RunTime:0.001293s ]
SELECT * FROM `edu_coursetype` WHERE ( parent='1' ) ORDER BY `listorder` ASC [ RunTime:0.000936s ]
SELECT * FROM `edu_coursetype` WHERE ( parent='2' ) ORDER BY `listorder` ASC [ RunTime:0.001077s ]
SHOW FULL COLUMNS FROM `edu_book` [ RunTime:0.001796s ]
SELECT * FROM `edu_book` WHERE `publish_time` >= 1748495524 [ RunTime:0.001076s ]
SHOW FULL COLUMNS FROM `edu_video_course` [ RunTime:0.001270s ]
SELECT * FROM `edu_video_course` WHERE `addtime` >= 1748495524 [ RunTime:0.001389s ]
SHOW FULL COLUMNS FROM `edu_nav` [ RunTime:0.000944s ]
SELECT * FROM `edu_nav` ORDER BY `sort_order` ASC [ RunTime:0.000523s ]
SHOW FULL COLUMNS FROM `edu_article_category` [ RunTime:0.001257s ]
SELECT * FROM `edu_article_category` ORDER BY `sort` ASC [ RunTime:0.001093s ]
SELECT * FROM `edu_article_category` WHERE `pid` = 1 AND `status` = 1 [ RunTime:0.001135s ]
SELECT * FROM `edu_book` ORDER BY rand() LIMIT 3 [ RunTime:0.001412s ]
SHOW FULL COLUMNS FROM `edu_article_tags` [ RunTime:0.001397s ]
SELECT `article_id` FROM `edu_article_tags` WHERE `tag_id` = 4 [ RunTime:0.000754s ]
SHOW FULL COLUMNS FROM `edu_article` [ RunTime:0.001373s ]
SELECT * FROM `edu_article` WHERE `id` = 5 AND `is_draft` = 0 AND `is_open` = '1' ORDER BY `likes` DESC LIMIT 0,10 [ RunTime:0.001144s ]
SHOW FULL COLUMNS FROM `edu_users` [ RunTime:0.001548s ]
SELECT * FROM `edu_users` WHERE `id` = 2 [ RunTime:0.000788s ]
SELECT `edu_article_category`.*,`pivot`.`id` AS `pivot__id`,`pivot`.`article_id` AS `pivot__article_id`,`pivot`.`tag_id` AS `pivot__tag_id` FROM `edu_article_category` INNER JOIN `edu_article_tags` `pivot` ON `pivot`.`tag_id`=`edu_article_category`.`id` WHERE `pivot`.`article_id` = '5' [ RunTime:0.001001s ]
SHOW FULL COLUMNS FROM `edu_article_comment` [ RunTime:0.001105s ]
SELECT COUNT(*) AS think_count FROM `edu_article_comment` WHERE `article_id` = 5 LIMIT 1 [ RunTime:0.000731s ]
SHOW FULL COLUMNS FROM `edu_article_likes` [ RunTime:0.001118s ]
SELECT * FROM `edu_article_likes` WHERE `article_id` = 5 AND `uid` = 0 LIMIT 1 [ RunTime:0.000699s ]
SELECT * FROM `edu_article_category` WHERE `pid` = 0 AND `status` = 1 ORDER BY `sort` ASC [ RunTime:0.000578s ]

0.143024s