Small update example optimized

gistfile1.sql

UPDATE wahlen_by_2013_test o
 SET averagevalue=n.averagevalue, 
 constituencyname=n.constituencyname,
 electionwinnerpartyname1=n.electionwinnerpartyname1,
 electionwinnerpartyname2=n.electionwinnerpartyname2,
 electionwinnerpartypercent1=n.electionwinnerpartypercent1,
 electionwinnerpartyperson1=n.electionwinnerpartyperson1,
 freie_waehler_percent2=n.freie_waehler_percent2,
 gruene_percent2=n.gruene_percent2,
 piraten_percent2=n.piraten_percent2,
 sonstige_percent2=n.sonstige_percent2,
 spd_percent2=n.spd_percent2,
 turnoutofvoters=n.turnoutofvoters
 FROM ( VALUES 
  (2.31,'Nürnberger Land','csu','csu',41.33,'Dünkel Norbert',10.73,9.24,1.85,10.22,24.44,68.7,511),
  (2.31,'Nürnberger Land','csu','csu',41.33,'Dünkel Norbert',10.73,9.24,1.85,10.22,24.44,68.7,511)
-- .... ONE LINE PER LAND! ....--

  ) n(
    averagevalue,
    constituencyname,
    electionwinnerpartyname1,
    electionwinnerpartyname2,
    electionwinnerpartypercent1,
    electionwinnerpartyperson1,
    freie_waehler_percent2,
    gruene_percent2,
    piraten_percent2,
    sonstige_percent2,
    spd_percent2,
    turnoutofvoters,
    constituencynr)
 WHERE o.constituencynr = n.constituencynr;