LCASE() 函数把字段的值转换为小写。
SELECT LCASE(column_name) FROM table_name;
SELECT LOWER(column_name) FROM table_name;
在本教程中,我们将使用 jb51 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 | 菜鸟学堂 | http://edu.jb51.net/ | 1689 | CN | | 4 | 微博 | http://weibo.com/ | 20 | CN | | 5 | Facebook | https://www.facebook.com/ | 3 | USA | | 7 | stackoverflow | http://stackoverflow.com/ | 0 | IND | +----+---------------+---------------------------+-------+---------+
下面的 SQL 语句从 "Websites" 表中选取 "name" 和 "url" 列,并把 "name" 列的值转换为小写:
SELECT LCASE(name) AS site_title, url FROM Websites;
执行以上 SQL 输出结果如下: