Question

So I got this error, I put the alias at num_documento (codigo “a.num_documento”) but Postgres says num_documento doesn’t exist.

ERROR: la referencia a la columna �num_documento� es ambigua 
Where: PL/pgSQL function "insertar_carga_giros"           
line 145 at sentencia SQ??? 

–Query function insertar_carga_giros

insert into bdsinc."codigo"(num_documento,id_tip_dcto,id_deudor) 
select distincta.num_documento,b.id_tip_dcto,b.id_deudor 
from bdsinc."carga" a
left join bdsinc."tb_deudor" b 
on a.num_documento=b.num_dcto 
and a.id_tip_dcto=b.id_tip_dcto
where b.id_deudor is not null and validacion=1;

How can I do an insert with select join inside in PostgreSQL?

Answer 1

This INSERT statement looks ok. You probably defined a variable name num_documento in your function that conflicts with the column name. Maybe an IN parameter?
Try renaming that variable.

Assuming that you actually have:

select distinct a.num_documento,b.id_tip_dcto,b.id_deud;