SQL UCASE()

UCASE() 函数

UCASE() 函数把字段的值转换为大写。

SQL UCASE() 语法

SELECT UCASE(column_name) FROM table_name;

用于 SQL Server 的语法

SELECT UPPER(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:

+----+--------------+---------------------------+-------+---------+
| 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 UCASE() 实例

下面的 SQL 语句从 "Websites" 表中选取 "name" 和 "url" 列,并把 "name" 列的值转换为大写:

实例

SELECT UCASE(name) AS site_title, url
FROM Websites; 
执行以上 SQL 输出结果如下:
mysql> select ucase(name) as site_title, url from websites;
+---------------+---------------------------+
| site_title    | url                       |
+---------------+---------------------------+
| GOOGLE        | https://www.google.cm/    |
| 淘宝          | https://www.taobao.com/   |
| 芝麻教程      | http://www.web3.xin/      |
| 微博          | http://weibo.com/         |
| FACEBOOK      | https://www.facebook.com/ |
| STACKOVERFLOW | http://stackoverflow.com/ |
+---------------+---------------------------+
6 rows in set (0.00 sec)
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