SELECT youtable.*
FROM yourtable
WHERE articleid IN (SELECT articleid
FROM yourtable
WHERE (fieldsid, value) IN ((1,1),(2,1))
GROUP BY articleid
HAVING COUNT(*)=2)
edit:om du bara behöver den första posten:
SELECT youtable.*
FROM yourtable
WHERE id IN (SELECT MIN(id)
FROM yourtable
WHERE (fieldsid, value) IN ((1,1),(2,1))
GROUP BY articleid
HAVING COUNT(*)=2)