mariadb add column foreign key code example
Example 1: mariadb add foreign key
alter table group_a
add constraint fk_b_in_a
foreign key(`b_id`)
references group_b(`b_id`)
on delete set null
on update set null;
Example 2: alter table add foreign key mariadb example
alter table caixa add foreign key (idcaixafluxo) references caixafluxo (idcaixafluxo);