SQL LCASE()

LCASE() 函数

LCASE() 函数把字段的值转换为小写。

SQL LCASE() 语法 

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SELECT LCASE(column_name) FROM table_name;

用于 SQL Server 的语法

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SELECT LOWER(column_name) FROM table_name;

演示数据库

在本教程中,我们将使用 web3 样本数据库。

下面是选自 "Websites" 表的数据:

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+----+--------------+---------------------------+-------+---------+
| id | name | url | alexa | country |
+----+--------------+---------------------------+-------+---------+
| 1 | Google | https://www.google.cm/ | 1 | USA |
| 2 | 淘宝 | https://www.taobao.com/ | 13 | CN |
| 3 | 芝麻教程 | http://www.web3.xin/ | 4689 | CN |
| 4 | 微博 | http://weibo.com/ | 20 | CN |
| 5 | Facebook | https://www.facebook.com/ | 3 | USA |
| 7 | stackoverflow | http://stackoverflow.com/ | 0 | IND |
+----+---------------+---------------------------+-------+---------+

SQL LCASE() 实例

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:

实例

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SELECT LCASE(name) AS site_title, url
FROM Websites;
执行以上 SQL 输出结果如下:
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mysql> select lcase(name) as site_title from websites;
+---------------+
| site_title |
+---------------+
| google |
| 淘宝 |
| 芝麻教程 |
| 微博 |
| facebook |
| stackoverflow |
+---------------+
6 rows in set (0.00 sec)
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