Is it possible to display only this exam which include correct answers for all questions? One exam include 5 question and 5 questions must be correct. If any 'exam id' column include wrong answer then must be rejected.

I give as an example some of my tables:

select * from exam;
+----+----------+---------+---------------------+
| id | epoch_id | user_id | data |
+----+----------+---------+---------------------+
| 1 | 2 | 42 | 2009-10-19 |
| 2 | 2 | 42 | 2009-10-19 |
| 32 | 2 | 57 | 2009-10-22 |
+----+----------+---------+---------------------+

mysql> select * from user;
+----+----------+-------------------------------------------+---------------------+
| id | nick | password | data |
+----+----------+-------------------------------------------+---------------------+
| 1 | girl | *8E9D6C8D53D | 2009-10-18 |
| 52 | boy | *29D53D98F2 | 2009-10-20 |
| 53 | men | *1C9A6D0E04 | 2009-10-20 |
| 54 | women | *D9FBF8CFF | 2009-10-20 |
| 55 | toto | *19584DAD40 | 2009-10-20 |
| 56 | water | *24830F9243 | 2009-10-20 |
| 57 | bear | *211A5945F4 | 2009-10-20 |
+----+----------+-------------------------------------------+---------------------+


mysql> select * from answer_user;
+-----+---------+-------------+-------------+---------------------+
| id | exam_id | question_id | user_answer | data |
+-----+---------+-------------+-------------+---------------------+
| 1 | 1 | 27 | b | 2009-10-19 |
| 2 | 1 | 19 | c | 2009-10-19 |
| 3 | 8 | 27 | b | 2009-10-19 |
| 4 | 8 | 19 | c | 2009-10-19 |
| 158 | 32 | 24 | d | 2009-10-22 |
+-----+---------+-------------+-------------+---------------------+


mysql> select * from questions where epoch_id=1;
+----+----------+-------------+---+---+---+---+-------------+
| id | epoch_id | question | a | b | c | d | true_answer |
+----+----------+-------------+---+---+---+---+-------------+
| 1 | 1 | Where is a? | b | a | c | d | b |
| 2 | 1 | Where is b? | a | c | b | d | c |
| 3 | 1 | Where is c? | d | b | a | c | d |
| 4 | 1 | Where is d? | d | b | a | c | a |
| 5 | 1 | Where is e? | a | e | c | d | b |
+----+----------+-------------+---+---+---+---+-------------+



I want gain something like this:
+------------+---------+-------------+
| nick | exam id | check |
+------------+---------+-------------+
| toto | 24 | good answer |
| toto | 24 | good answer |
| toto | 24 | good answer |
| toto | 24 | good answer |
| toto | 24 | good answer |
| bear | 29 | good answer |
| bear | 29 | good answer |
| bear | 29 | good answer |
| bear | 29 | good answer |
| bear | 29 | good answer |
| water | 31 | good answer |
| water | 31 | good answer |
| water | 31 | good answer |
| water | 31 | good answer |
| water | 31 | good answer |
| girl | 32 | good answer |
| girl | 32 | good answer |
| girl | 32 | good answer |
| girl | 32 | good answer |
| girl | 32 | good answer |
+------------+---------+-------------+

Thanks in advance for any helps.