Question

I have two tables and i try to create a table for managing data.

the first table is “questions”:

questions (question_id, key1, key2, key3, key4, user_id, creation_date, class, type     permission)

and the other:

questions_keys (question_key_id, question_key_name, question_key_refers_to)

every time i push the submit button stored in the table question_keys four records and one in table of questions. heres an example:

question_keys:

1, mathematics, 0
2, history, 1
3, physics, 2
4, geography, 3

and question table:

(1, 1, 2, 3, 4, 8, 2012-12-19 20:41:48, 4, multiple_choice,     0)

the query i need: in the table show the question_key_name where key1, key2, key3, key4 in table questions is equal to question_key_id.

and show in one row something like this:

mathematics, history, physics, geography, multiple_choice, 2012-12-19 20:41:48 etc

i’m new and i need your help.. thanks a lot!

Answer 1

Try this:

SELECT qk1.question_key_name qk2.question_key_name, qk3.question_key_name, 
       qk4.question_key_name, q.type, q.creation_date 
FROM questions q 
INNER JOIN question_keys qk1 ON q.key1 = qk1.question_key_id 
INNER JOIN question_keys qk2 ON q.key2 = qk2.question_key_id 
INNER JOIN question_keys qk3 ON q.key3 = qk3.question_key_id 
INNER JOIN question_keys qk4 ON q.key4 = qk4.question_key_id;