ALTER TABLE paises ADD CONSTRAINT paises_pk PRIMARY KEY ( id );

ALTER TABLE paises ADD CONSTRAINT paises_codigo_ddi UNIQUE ( ddi_codigo );

ALTER TABLE paises ADD CONSTRAINT paises_ibge_cod UNIQUE ( ibge_codigo );

ALTER TABLE paises ADD CONSTRAINT paises_siglaiso UNIQUE ( sigla_iso );

ALTER TABLE paises ADD CONSTRAINT paises_siglaiso3 UNIQUE ( sigla_iso3 );