select a.*,b.s_score as score01, c.s_score as score02 FROM student a JOIN score b ON a.s_id=b.s_id and b.c_id='01' LEFT JOIN score c ON a.s_id=c.s_id and c.c_id='02' or... 查看更多
ERROR 1130 (HY000): Host '127.0.0.1' is not allowed to connect to this MySQL serverMySQL 登录时出现不允许 127.0.0.1 登录的错误,是因为 MySQL 库的 User 表中的 Host 字段没有授权用户... 查看更多