实例将更新数据表中 runoob_id 为 3 的 runoob_title 字段值：
SQL UPDATE 语句：
mysql> UPDATE runoob_tbl SET runoob_title='学习 C++' WHERE runoob_id=3;
Query OK, 1 rows affected (0.01 sec)
mysql> SELECT * from runoob_tbl WHERE runoob_id=3;
+-----------+--------------+---------------+-----------------+
| runoob_id | runoob_title | runoob_author | submission_date |
+-----------+--------------+---------------+-----------------+
| 3 | 学习 C++ | RUNOOB.COM | 2016-05-06 |
+-----------+--------------+---------------+-----------------+
1 rows in set (0.01 sec)
从结果上看，runoob_id 为 3 的 runoob_title 已被修改。
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