create table usuario
(
  id     serial primary key,
  nome   varchar(100) not null,
  codigo varchar(11)  not null,
  idade  integer      not null
);

CREATE OR REPLACE FUNCTION random_text_md5_v2(INTEGER)
  RETURNS TEXT
LANGUAGE SQL
AS $$
select upper(
         substring(
           (SELECT string_agg(md5(random() :: TEXT), '') FROM generate_series(
                                                                1,
                                                                CEIL($1 / 32.) :: integer)), 1, $1));
$$;

CREATE OR REPLACE FUNCTION generate_age(low INT, high INT)
  RETURNS INT AS
$$
BEGIN
  RETURN floor(random() * (high - low + 1) + low);
END;
$$
language 'plpgsql'
STRICT;

insert into usuario (nome, codigo, idade)
SELECT name_first_male || ' ' || last_name_part1, random_text_md5_v2(11), generate_age(18, 65)
FROM (SELECT (SELECT concat('Marie-', string_agg(x, '-')) as name_first_female
              FROM (select start_arr [ 1 + ((random() * 100) :: int) % 32 ]
                    FROM (select '{Claude,Thérèse,Géraldine,Sylvie,Sophie,Solange,Vivianne,Cunégonde,Albertine,Charlotte,Caroline,Célestine,Bérangère,Sylvianne,Alphonsine,Claire,Françoise,Chantal,Geneviève,Christine,Louise,Adeline,Céleste,Angélique,Clothilde,Jeanne,Pierre,Valentine,Paule,Noëlle,Lise,Cécile}' :: text [] as start_arr) syllarr,
                        -- need 3 syllabes, and force generator interpretation with the '*0' (else 3 same syllabes)
                         generate_series(1,
                                         1 + (((generator :: int % 3) * (random() * 0.5)) :: int % 3))) AS con_name_female (x)),
             (SELECT concat('Jean-', string_agg(y, '-')) as name_first_male
              FROM (select start_arr [ 1 + ((random() * 100) :: int) % 33 ]
                    FROM (select '{François,Pierre,Michel,Sylvain,Sébastien,Eudes,Raymond,Claude,Régis,Charles,Maxence,Célestin,Baptiste,Grégoire,Hubert,Antonin,Stanislas,Gérald,Albert,Marie,Guy,Yves,Louis,Gabriel,Jérémie,Bartholomé,Mathieu,Vincent,Nicolas,Joachim,Olivier,Daniel,Philippe}' :: text [] as start_arr) syllarr,
                        -- need 3 syllabes, and force generator interpretation with the '*0' (else 3 same syllabes)
                         generate_series(1,
                                         1 + (((generator :: int % 3) * (random() * 0.5)) :: int % 3))) AS con_name_male (y)),
             (SELECT concat(last_name_part1a, last_char) as last_name_part1
              FROM (SELECT initcap(concat(string_agg(z1, ''))) as last_name_part1a
                    FROM (select last_arr [ 1 + ((random() * 100 + (generator * 0)) :: int) % 35 ]
                          FROM (select '{cu,char,bar,rau,reau,ban,beau,che,choi,moi,dur,dup,bou,gre,gru,choi,chau,col,ast,ara,ame,aud,souch,chon,bon,cheau,tallo,lio,chau,ron,rency,ramb}' :: text [] as last_arr) sub1,
                               generate_series(1, 3 + (generator * 0))) AS con_name_first (z1)) sub2,
                   (select last_last [ 1 + ((random() * 10 + (generator * 0)) :: int) % 6 ] as last_char
                    FROM (select '{x,t,d,e,s}' :: text [] as last_last) sub3) sub4),
             (select part_arr [ 1 + ((random() * 100 + (generator * 0)) :: int) % 50 ] as last_name_part2
              FROM (select '{II,III,De Loinloin,De Meumeu,De Parloin,De Parlà,De MontLoin,De Vallointain,De Perpète,De Pétaouchnok,De Trifouillis-Les-Oies,De Clochemerle,Du Troupaumé,De Saint-glin-glin,De Berdouille,De Macapète,De Foufnie,De Pamparigouste,De GlinGlin,De Linlin,De Fouillard,D''Apeuprès,D''Icibas,D''Autemps,D''Auloin}' :: text [] as part_arr) sub),
             generator as id
      FROM generate_series(1, 1000000) as generator) main_sub;

explain analyse select * from usuario where nome ilike '%Eudes%';
explain analyse select * from usuario where codigo ilike '%4bc%';
explain analyse select * from usuario where nome ilike '%eudes%' and codigo ilike '%4bc%';

CREATE EXTENSION pg_trgm;

CREATE INDEX ix_usuario_nome ON usuario USING gin (nome gin_trgm_ops);
CREATE INDEX ix_usuario_codigo ON usuario USING gin (codigo gin_trgm_ops);

explain analyse select * from usuario where nome ilike '%Eudes%';
explain analyse select * from usuario where codigo ilike '%4bc%';
explain analyse select * from usuario where nome ilike '%eudes%' and codigo ilike '%4bc%';