How to Find Items that Do NOT Have a pre-Pipe "Base" Value - sql

Question

I have a database with a column (obj_id) in a table (parts) where I SHOULD have an obj_id of 12345 that is a set for another row that would have 12345|.
So:
select obj_id from parts where obj_id like '12345%';
12345
12345|A
12345|B
12345|77
Now, someone violated the guideline and put in some items with the piped-value but not the base value w/o the pipe (e.g. 12378|J, 12378|8 but not 12378).
I need to know how to write a SQL query to find these piped-values that do NOT have their matching base (non-piped) value in the table.

Answer 1

Without some realistic sample data to work with it's hard to know what you really want. Below a 2 queries that may be of assistance, but perhaps it will also make you note how useful sample data can be:
See this working at SQL Fiddle
CREATE TABLE PARTS
(id int, OBJ_ID varchar2(200))
;
INSERT ALL
INTO PARTS (id, OBJ_ID)
VALUES (1,'12345 12345|A 12345|B 12345|77')
INTO PARTS (id, OBJ_ID)
VALUES (2,'12346|A 12346|B 12346|77')
INTO PARTS (id, OBJ_ID)
VALUES (3,'12378|J, 12378|8')
INTO PARTS (id, OBJ_ID)
VALUES (4,NULL)
INTO PARTS (id, OBJ_ID)
VALUES (5,'fred. wilma, barney, betty')
SELECT * FROM dual
;
Query 1:
select
*
from PARTS p
where instr(p.OBJ_ID,' ') > instr(p.OBJ_ID,'|')
Results:
| ID | OBJ_ID |
|----|----------------------------|
| 2 | 12346|A 12346|B 12346|77 |
| 3 | 12378|J, 12378|8 |
| 5 | fred. wilma, barney, betty |
Query 2:
select
id, rn_a, regexp_substr (OBJ_ID_SPLIT, '[^|]+', 1, rn_b) as OBJ_ID_SPLIT
from (
select
p.id, c1.rn_a, regexp_substr (p.OBJ_ID, '[^ ]+', 1, c1.rn_a) as OBJ_ID_SPLIT
from PARTS p
cross join (select rownum as rn_a
from (select max(length (regexp_replace (OBJ_ID, '[^|]+'))) + 1 as mx
from PARTS
)
connect by level <= mx) c1
where p.OBJ_ID like '%|%'
) d
cross join (select 1 rn_b from dual union all select 2 from dual) c2
order by id, rn_a
Results:
| ID | RN_A | OBJ_ID_SPLIT |
|----|------|--------------|
| 1 | 1 | 12345 |
| 1 | 1 | (null) |
| 1 | 2 | 12345 |
| 1 | 2 | A |
| 1 | 3 | 12345 |
| 1 | 3 | B |
| 1 | 4 | 12345 |
| 1 | 4 | 77 |
| 2 | 1 | 12346 |
| 2 | 1 | A |
| 2 | 2 | 12346 |
| 2 | 2 | B |
| 2 | 3 | 12346 |
| 2 | 3 | 77 |
| 2 | 4 | (null) |
| 3 | 1 | 12378 |
| 3 | 1 | J, |
| 3 | 2 | 12378 |
| 3 | 2 | 8 |
| 3 | 3 | (null) |
| 3 | 4 | (null) |