Question

I’m trying to run the following query:

SELECT parent_id, id, due_date, object_subtype
  FROM amatia_logtask
 WHERE parent_id IN (SELECT id_actividad
                       FROM amatia_actividades
                      WHERE id_actividad = '12624'
                         OR id_padre = '12624')
 GROUP BY parent_id id

However, I’m unable to understand the error message:

ORA-00933: SQL command not properly ended
00933. 00000 -  "SQL command not properly ended"
*Cause:    
*Action:
Error at Line: 9 Column: 41

Please can you provide an explanation?

Answer 1

The GROUP BY clause is a comma separated list of columns or expressions, so you’re missing a comma.

You will still get an error since all expressions in the SELECT clause need to be either grouped by or aggregates (using aggregate functions).

So you may want to write:

SELECT parent_id, id, due_date, object_subtype
  FROM amatia_logtask
 WHERE parent_id IN (SELECT id_actividad
                       FROM amatia_actividades
                      WHERE id_actividad = '12624'
                         OR id_padre = '12624')
 GROUP BY parent_id, id, due_date, object_subtype

A GROUP BY query without aggregates is essentially a DISTINCT query, so you can also use distinct here to hint at your intent:

SELECT DISTINCT parent_id, id, due_date, object_subtype
  FROM amatia_logtask
 WHERE parent_id IN (SELECT id_actividad
                       FROM amatia_actividades
                      WHERE id_actividad = '12624'
                         OR id_padre = '12624')