ERROR 1052 (23000): Column 'id' in field list is ambiguous
列'ID'在字段列表中重复，其实就是两张表有相同的字段，但是使用时表字段的名称前没有加表名，导致指代不明
如
SELECT student.name, student.student_id, score.score FROM student INNER JOIN score ONstudent.student_id = score.student_id WHERE student.name='mio';
+------+------------+-------+
| name | student_id | score |
+------+------------+-------+
| mio | 1 | 99 |
| mio | 1 | 77 |
| mio | 1 | 88 |
| mio | 1 | 99 |
+------+------------+-------+
4 rows in set (0.00 sec)
