报错信息：

mysql> insert into a values(202,"王一");
ERROR 1366 (HY000): Incorrect string value: '\xE7\x8E\x8B\xE4\xB8\x80' for column 'tname' at row 1

原因：编码问题

数据表a的编码默认为（latin1）：

mysql> show create table a
    -> ;
+-------+------------------------------------------------------------------------------------------------------------------------+
| Table | Create Table                                                                                                           |
+-------+------------------------------------------------------------------------------------------------------------------------+
| a     | CREATE TABLE `a` (
  `tno` int(4) DEFAULT NULL,
  `tname` char(20) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1 |
+-------+------------------------------------------------------------------------------------------------------------------------+
1 row in set (3.91 sec)

修改表A的编码：

mysql> alter table a convert to character set utf8;
mysql> show create table a
    ->
    ->
    -> ;
+-------+----------------------------------------------------------------------------------------------------------------------+
| Table | Create Table                                                                                                         |
+-------+----------------------------------------------------------------------------------------------------------------------+
| a     | CREATE TABLE `a` (
  `tno` int(4) DEFAULT NULL,
  `tname` char(20) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8 |
+-------+----------------------------------------------------------------------------------------------------------------------+
1 row in set (0.09 sec)

插入数据

mysql> insert into a values(202,"王一");
Query OK, 1 row affected (0.04 sec)
问题解决。。