Table: rafael_nadal_tennis_matches
Columns: outcome
year
championship
surface
opponent
score

Question: What was the score on a clay surface in a year later than 2006 with David Ferrer as an opponent?
SQL: SELECT "score" FROM rafael_nadal_tennis_matches WHERE "surface" = 'clay' AND "year" > 2006 AND "opponent" = 'david ferrer'

Question: Which championship is in a year later than 2010 on a grass surface?
SQL: SELECT "championship" FROM rafael_nadal_tennis_matches WHERE "year" > 2010 AND "surface" = 'grass'

Question: Which championship has Roger Federer as an opponent on a clay surface in a year earlier than 2007?
SQL: SELECT "championship" FROM rafael_nadal_tennis_matches WHERE "opponent" = 'roger federer' AND "surface" = 'clay' AND "year" < 2007