How to insert a primary/foreign key row in PostgreSQL -


i'm populating database in postgresql newspaper online. doubt lies on how insert value table attribute both primary , foreign key.

in context, admin first person ever register account. idadmin = ida = 1:

create table autenticado (     ida serial not null ,     login varchar(45) not null,     password varchar(45) not null,     email varchar(40) not null,     primary key (ida) );  create table admin (     idadmin int  not null references autenticado (ida),     primary key (idadmin) );

it logical insert values 'admin' tried below, although not possible considering 'idadmin' primary key (and foreign key).

insert autenticado values ('john','adadfsfsdfs', 'john@random.com') insert admin values (1)

is there way register first user create account (ida = 1) admin (idadmin = ida = 1) ?

although not possible considering 'idadmin' primary key (and foreign key).

so what?

if fix first query list columns , use returning clause auto-generated value serial id, works:

insert autenticado(login,password,email)   values ('john','adadfsfsdfs', 'john@random.com')   returning ida;

result:

  ida  -----    1 (1 row)

second query:

insert admin values(1); select * admin;

result:

  idadmin  ---------        1

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