IF(n1.nat = '', n1.pays, n1.nat) AS nat1, n1.a2 AS iso3166_1,
IF(n2.nat = '', n2.pays, n2.nat) AS nat2, n2.a2 AS iso3166_2,
IF(n3.nat = '', n3.pays, n3.nat) AS nat3, n3.a2 AS iso3166_3,
IF(n1.nat = '', n1.pays, n1.nat) AS nat1, n1.a2 AS iso3166_1,
IF(n2.nat = '', n2.pays, n2.nat) AS nat2, n2.a2 AS iso3166_2,
IF(n3.nat = '', n3.pays, n3.nat) AS nat3, n3.a2 AS iso3166_3,