mysql 表关联查询报错 ERROR 1267 (HY000)

解决翻案：http://stackoverflow.com/questions/1008287/illegal-mix-of-collations-mysql-error

即：

SET collation_connection = 'utf8_general_ci';
ALTER DATABASE db CHARACTER SET utf8 COLLATE utf8_general_ci;
ALTER TABLE table CONVERT TO CHARACTER SET utf8 COLLATE utf8_general_ci;