Applying the decision tree in the database

Question

Description:

I have a case in finding a solution to a problem. rules to find the solution as follows:

Case 1: IF T01 AND T02 AND T03 THEN S01

Case 2: IF T04 THEN S02

Case 3: IF T04 AND T05 AND T06 THEN S03

To display the questions on the matter, set based on a decision tree. at the time of problem 1 (T1) asked, then there is a yes or no answer. if you have problems, a selected 'yes'. if it does not have this problem, then selected the answer 'no'. followed by asking about the next problem until a solution (S) is found.

My question:

1. how do I apply the rule or the decision tree in a database?
2. whether there are other ways to find a solution (S) but the question of problem must be a sequence based on the decision tree?

please see the decision tree on the following link here .

Caption:

T = trouble/problem; 
S = solution; 
Y = if answer is YES; 
N = if answer is NO; 

Thank you

Answer 1

This could be achieved with something like:

-----------------------------------------------------
| decisionId | ifTrueDecisionId | ifFalseDecisionId | 
=====================================================
| T01        | T02              | T04               |
-----------------------------------------------------
| T02        | T03              | S0                |
-----------------------------------------------------
| T03        | S1               | S0                |
-----------------------------------------------------
| T04        | T05              | S0                |
-----------------------------------------------------

And so on....

You can then do a SQL query based on the Trouble/Problem stated. The result gives you directions for a new question. Where again you query for the next step.

Answer 2

SELECT
  ...,
  IF(T01,
    IF(T02,
      IF(T03,
        S01,
        S0
      ),
      S0
    ),
    IF(T04,
      IF(T05,
        IF(T06,
           S03,
           S0,
        ),
        S02
      ),
      S0
    )
  ) AS some_field_alias
...

according to http://oi59.tinypic.com/24cw9ye.jpg

using this http://dev.mysql.com/doc/refman/5.1/en/control-flow-functions.html#function_if

You can use this logic right in mysql query. Each T* could be a sub-request as well as S*.