Question

I’m really not sure how to title this question… Imagine that we have a table looking like this:

object | attribute | value
------------------------------
   7     country     Germany
   7     position    12
   7     points      12
   8     country     Germany
   8     position    10
   8     points      3

Now I want to select all object identifiers that has country germany and position 12 or 5

I have no idea how to write this query, is it possible?

Answer 1

Join as many times as you need additional query options:

SELECT t1.object
FROM table t1
    INNER JOIN table t2 ON t1.object = t2.object
WHERE t1.attribute = 'country' AND t1.value = 'Germany'
    AND t2.attribute = 'position' AND t2.value IN (12,5)