Question

Here is my query. v.location is a column which contains floor and room information, i.e. FL 2 RM 204. I need to compare this against the mv_rooms table which has the room and floor split into two separate columns.

select v.location, v.customer_name, v.street_name
from voip_validate v, mv_rooms r, mv_buildings b
left outer join voip_validate
on v.location = 'FL ' || r.floor || ' RM ' || r.room
where 'FL ' || r.floor || ' RM ' || r.room is null
and b.dps_number = r.dps_number;

When I run the query, I get the error:

ORA-00904: “R”.”ROOM”: invalid identifier
00904. 00000 – “%s: invalid identifier”
*Cause:
*Action:
Error at Line: 4 Column: 47

Answer 1

you’re mixing oracle join syntax and ANSI.

select v.location, v.customer_name, v.street_name
  from voip_validate v
       left outer join mv_rooms r
                    on v.location = 'FL ' || r.floor || ' RM ' || r.room
       left outer join mv_buildings b
               on b.dps_number = r.dps_number
 where r.room is null

also your where clause is totally wrong as it can never be null.

where 'FL ' || r.floor || ' RM ' || r.room is null

were you intending to return rows that had no matching row in “V”?