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SQL ORDER BY 关键字
SQL ORDER BY 关键字ORDER BY 关键字用于对结果集进行排序。SQL ORDER BY 关键字ORDER BY 关键字用于对结果集按照一个列或者多个列进行排序。ORDER BY 关键字默认按照升序对记录进行排序。如果需要按照降序对记录进行排序,您可以使用 DESC 关键字。SQL ORDER BY 语法SELECT column_name,column_nameFROM table_nameORDER BY column_name,column_name ASC|DESC;演示数据库在本教程中,我们将使用 RUNOOB 样本数据库。下面是选自 "Websites" 表的数据:+----+--------------+---------------------------+-------+---------+| id | name | url | alexa | country |+----+--------------+---------------------------+-------+---------+| 1 | Google | https:
//www.google.cm/ | 1 | USA || 2 | 淘宝 | https:
//www.taobao.com/ | 13 | CN || 3 | k88.net | http:
//www.k88.net/ | 4689 | CN || 4 | 微博 | http:
//weibo.com/ | 20 | CN || 5 | Facebook | https:
//www.facebook.com/ | 3 | USA |+----+--------------+---------------------------+-------+---------+ORDER BY 实例下面的 SQL 语句从 "Websites" 表中选取所有网站,并按照 "alexa" 列排序:实例SELECT * FROM WebsitesORDER BY alexa;执行输出结果:ORDER BY DESC 实例下面的 SQL 语句从 "Websites" 表中选取所有网站,并按照 "alexa" 列降序排序:实例SELECT * FROM WebsitesORDER BY alexa DESC;执行输出结果:ORDER BY 多列下面的 SQL 语句从 "Websites" 表中选取所有网站,并按照 "country" 和 "alexa" 列排序:实例SELECT * FROM WebsitesORDER BY country,alexa;执行输出结果:
//www.google.cm/ | 1 | USA || 2 | 淘宝 | https:
//www.taobao.com/ | 13 | CN || 3 | k88.net | http:
//www.k88.net/ | 4689 | CN || 4 | 微博 | http:
//weibo.com/ | 20 | CN || 5 | Facebook | https:
//www.facebook.com/ | 3 | USA |+----+--------------+---------------------------+-------+---------+ORDER BY 实例下面的 SQL 语句从 "Websites" 表中选取所有网站,并按照 "alexa" 列排序:实例SELECT * FROM WebsitesORDER BY alexa;执行输出结果:ORDER BY DESC 实例下面的 SQL 语句从 "Websites" 表中选取所有网站,并按照 "alexa" 列降序排序:实例SELECT * FROM WebsitesORDER BY alexa DESC;执行输出结果:ORDER BY 多列下面的 SQL 语句从 "Websites" 表中选取所有网站,并按照 "country" 和 "alexa" 列排序:实例SELECT * FROM WebsitesORDER BY country,alexa;执行输出结果:
SQL ORDER BY 关键字