mysql> SHOW VARIABLES LIKE "%version%";
+-------------------------+------------------------------+
| Variable_name           | Value                        |
+-------------------------+------------------------------+
| protocol_version        | 10                           |
| version                 | 5.1.73                       |
| version_comment         | MySQL Community Server (GPL) |
| version_compile_machine | i386                         |
| version_compile_os      | apple-darwin10.3.0           |
+-------------------------+------------------------------+
5 rows in set (0.00 sec)

mysql -S /tmp/mysql_5173.sock -uroot -proot

mysql> USE test;
Database changedmysql> CREATE TABLE user-> (name VARCHAR(20)->  ) DEFAULT CHARSET = utf8 ENGINE = INNODB;
Query OK, 0 rows affected (0.10 sec)mysql> SHOW TABLE STATUS LIKE 'user' G;
*************************** 1. row ***************************Name: userEngine: InnoDBVersion: 10Row_format: CompactRows: 2
Avg_row_length: 8192Data_length: 16384
Max_data_length: 0Index_length: 0Data_free: 0
Auto_increment: NULLCreate_time: 2015-01-16 18:01:36Update_time: NULLCheck_time: NULLCollation: utf8_general_ciChecksum: NULL
Create_options:Comment:
1 row in set (0.00 sec)ERROR:
No query specifiedmysql> INSERT INTO user VALUES('robin');
Query OK, 1 row affected (0.01 sec)mysql> INSERT INTO user VALUES('温国兵');
Query OK, 1 row affected (0.00 sec)

mysql> SELECT * FROM user G;
*************************** 1. row ***************************
name: robin
*************************** 2. row ***************************
name: 温国兵
2 rows in set (0.00 sec)mysql> SELECT name,->     CASE name REGEXP "[u0391-uFFE5]"->         WHEN 1 THEN "不是中文字符"->         ELSE "是中文字符"->     END AS "判断是否是中文字符"-> FROM user;
+-----------+-----------------------------+
| name      | 判断是否是中文字符 |
+-----------+-----------------------------+
| robin     | 不是中文字符          |
| 温国兵 | 是中文字符             |
+-----------+-----------------------------+
2 rows in set (0.00 sec)mysql> SELECT name FROM user WHERE NOT (name REGEXP "[u0391-uFFE5]");
+-----------+
| name      |
+-----------+
| 温国兵 |
+-----------+
1 row in set (0.00 sec)

mysql> SELECT name, length(name), char_length(name) FROM user;
+-----------+--------------+-------------------+
| name      | length(name) | char_length(name) |
+-----------+--------------+-------------------+
| robin     |            5 |                 5 |
| 温国兵 |           20 |                 9 |
+-----------+--------------+-------------------+
2 rows in set (0.00 sec)mysql> SELECT name FROM user WHERE length(name)  char_length(name);
+-----------+
| name      |
+-----------+
| 温国兵 |
+-----------+
1 row in set (0.00 sec)