Selection of the records that have no referencing records at a small price

I try to get records that has no records of references. Here's the script and test the query I wrote to get the result.
I can get result, but my problem is to lower the cost. This table has more than 50,000 rows. Hope someone can guide me to write a better query.

create table ot_req (rh_sysid rh_txn_type VARCHAR2 (NO.4), rh_ref_sys_id (5), (4), rh_ref_txn_cod VARCHAR2 (5));

INSERT INTO ot_req VALUES (800, 'MR SS', NULL, NULL);
INSERT INTO ot_req VALUES(801,'SSPR',800,'SSMR');
INSERT INTO ot_req VALUES(810,'SSMR',,);
INSERT INTO ot_req VALUES(811,'SSMR',,);
INSERT INTO ot_req VALUES(812,'SSMR',,);
INSERT INTO ot_req VALUES(813,'SSPR',812,'SSMR');
INSERT INTO ot_req VALUES(814,'SSMR',,);
INSERT INTO ot_req VALUES(815,'SSPR',814,'SSMR');


SELECT
rh_sysid
Of
ot_req
WHERE
rh_sysid
PO NO
(SELECT
rh_ref_sys_id
Of
ot_req
WHERE
rh_ref_sys_id IS NOT NULL)
AND
rh_txn_type! = "SŠPR";

Result

RH_SYSID
810
811

Looking forward to your support.

Thanks in advance :)

Unus wrote:
My problem is to lower the cost.

rh_ref_sys_id will never be sšpr. Only sšpr will reference number

SQL> exec dbms_stats.gather_table_stats(user,'ot_req')

PL/SQL-procedure is geslaagd.

SQL> set autotrace on
SQL> select rh_sysid
  2    from ot_req
  3   where rh_sysid not in
  4         ( select rh_ref_sys_id
  5             from ot_req
  6            where rh_ref_sys_id is not null
  7         )
  8     and rh_txn_type!='SSPR'
  9  /

  RH_SYSID
----------
       810
       811

2 rijen zijn geselecteerd.

Uitvoeringspan
----------------------------------------------------------
Plan hash value: 2746377339

-----------------------------------------------------------------------------
| Id  | Operation          | Name   | Rows  | Bytes | Cost (%CPU)| Time     |
-----------------------------------------------------------------------------
|   0 | SELECT STATEMENT   |        |     5 |    60 |     7  (15)| 00:00:01 |
|*  1 |  HASH JOIN ANTI SNA|        |     5 |    60 |     7  (15)| 00:00:01 |
|*  2 |   TABLE ACCESS FULL| OT_REQ |     5 |    50 |     3   (0)| 00:00:01 |
|*  3 |   TABLE ACCESS FULL| OT_REQ |     3 |     6 |     3   (0)| 00:00:01 |
-----------------------------------------------------------------------------

Predicate Information (identified by operation id):
---------------------------------------------------

   1 - access("RH_SYSID"="RH_REF_SYS_ID")
   2 - filter("RH_TXN_TYPE"<>'SSPR')
   3 - filter("RH_REF_SYS_ID" IS NOT NULL)

Statistics
----------------------------------------------------------
          1  recursive calls
          0  db block gets
         14  consistent gets
          0  physical reads
          0  redo size
        469  bytes sent via SQL*Net to client
        416  bytes received via SQL*Net from client
          2  SQL*Net roundtrips to/from client
          0  sorts (memory)
          0  sorts (disk)
          2  rows processed

SQL> select nvl(rh_ref_sys_id,rh_sysid) rh_sysid
  2    from ot_req
  3   group by nvl(rh_ref_sys_id,rh_sysid)
  4  having count(*) = 1
  5  /

  RH_SYSID
----------
       810
       811

2 rijen zijn geselecteerd.

Uitvoeringspan
----------------------------------------------------------
Plan hash value: 2435394825

------------------------------------------------------------------------------
| Id  | Operation           | Name   | Rows  | Bytes | Cost (%CPU)| Time     |
------------------------------------------------------------------------------
|   0 | SELECT STATEMENT    |        |     1 |     6 |     4  (25)| 00:00:01 |
|*  1 |  FILTER             |        |       |       |            |          |
|   2 |   HASH GROUP BY     |        |     1 |     6 |     4  (25)| 00:00:01 |
|   3 |    TABLE ACCESS FULL| OT_REQ |     8 |    48 |     3   (0)| 00:00:01 |
------------------------------------------------------------------------------

Predicate Information (identified by operation id):
---------------------------------------------------

   1 - filter(COUNT(*)=1)

Statistics
----------------------------------------------------------
          1  recursive calls
          0  db block gets
          7  consistent gets
          0  physical reads
          0  redo size
        469  bytes sent via SQL*Net to client
        416  bytes received via SQL*Net from client
          2  SQL*Net roundtrips to/from client
          0  sorts (memory)
          0  sorts (disk)
          2  rows processed

Kind regards
Rob.

Tags: Database

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