Question

Searching for a while now, but haven’t found a suitable answer to my problem.

Explanation:

ID | Year |  Factor1 | Number1 | Number2
1  | 2010 |   213    |    1     |   1     
2  | 2010 |   213    |    1     |   2    
3  | 2010 |   214    |    2     |   1    
4  | 2010 |   214    |    2     |   2    
6  | 2010 |   210    |    3     |   1    
7  | 2010 |   210    |    3     |   2   
8  | 2011 |   250    |    3     |   5 
5  | 2012 |   214    |    2     |   4    

EDIT:
Forgot Something, corrected that in the above table.
I need 2 combinations: year and factor1 only once, then min(number1) and last min(number2).
For example above I would need IDs 1,3,5,6,8 (sorry they are mixed for better readability of the other values).

Anyone any idea how to realize that?

Answer 1

Got the code now from another forum, works fine for me:

SELECT 
  tab.*
FROM
  t33 tab
  INNER JOIN (
    SELECT
      m1.y,
      m1.factor1,
      m1.min_1,
      m2.min_2
    FROM
      (
        SELECT
          y,
          factor1,
          MIN(number1) AS min_1
        FROM
          t33 tab
        GROUP BY
          y,
          factor1
      ) m1
      INNER JOIN (
        SELECT 
              y,
              factor1,
              number1,
              MIN(number2) AS min_2
            FROM 
              t33
            GROUP BY
              y,
              factor1,
              number1
        ) m2
      ON m1.y = m2.y
      AND m1.factor1 = m2.factor1
      AND m1.min_1 = m2.number1
    ) sel
      ON tab.y = sel.y
      AND tab.factor1 = sel.factor1
      AND tab.number1 = sel.min_1
      AND tab.number2 = sel.min_2