按照书上的实例，创建触发器怎么报错啊？

mysql> select * from b1;
+------+----------+
| id   | name     |
+------+----------+
|    1 | zhangsan |
|    2 | lisi     |
|    4 | wangwu   |
|    5 | tset11   |
+------+----------+
4 rows in set (0.01 sec)mysql> CREATE TRIGGER b1_test AFTER INSERT on b1 FOR EACH ROW select 'uuuu';
ERROR 1415 (0A000): Not allowed to return a result set from a trigger
mysql> [root@master ~]# /usr/local/mysql/bin/mysql -V
/usr/local/mysql/bin/mysql  Ver 14.12 Distrib 5.0.51a, for pc-linux-gnu (i686) using readline 5.0