SELECT ometeam,fthg,awayteam,ftag AS results
FROM (
  SELECT * AS TEAM,
    CASE
      WHEN  hometeam LIKE 'Eibar' AND  awayteam LIKE 'Alaves'
      END
  FROM sp1 AS tabla

   UNION ALL

  SELECT * AS TEAM,
    CASE
      WHEN  hometeam LIKE 'Alaves' AND  awayteam LIKE 'Eibar'
      END
  FROM sp1 AS tabla

)  as total