Postgresql column reference “id” is ambiguous

Question

I tried the following select:

SELECT (id,name) FROM v_groups vg 
inner join people2v_groups p2vg on vg.id = p2vg.v_group_id
where p2vg.people_id =0;

Answer 1

SELECT vg.id, 
       vg.name
  FROM v_groups vg INNER JOIN  
       people2v_groups p2vg ON vg.id = p2vg.v_group_id
 WHERE p2vg.people_id = 0;

Answer 2

SELECT (vg.id, name) FROM v_groups vg 
INNER JOIN people2v_groups p2vg ON vg.id = p2vg.v_group_id
WHERE p2vg.people_id = 0;

Answer 3

You need the table name/alias in the SELECT part (maybe (vg.id, name)) :

SELECT (vg.id, name) FROM v_groups vg 
inner join people2v_groups p2vg on vg.id = p2vg.v_group_id
where p2vg.people_id =0;

Answer 4

I suppose your p2vg table has also an id field , in that case , postgres cannot find if the id in the SELECT refers to vg or p2vg.

you should use SELECT(vg.id,vg.name) to remove ambiguity