create table t1(id number, idd varchar2(10));
insert into t1 values( 1, '11');
insert into t1 values(2, '22');
commit;
SQL> create index idx_idd_t1 on t1(to_number(idd));
Index created.
SQL> select * from t1 where idd='11';
ID IDD
---------- ----------
1 11
Execution Plan
----------------------------------------------------------
Plan hash value: 3617692013
--------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
--------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 1 | 20 | 2 (0)| 00:00:01 |
|* 1 | TABLE ACCESS FULL| T1 | 1 | 20 | 2 (0)| 00:00:01 |
--------------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
1 - filter("IDD"='11')
Note
-----
- dynamic sampling used for this statement (level=2)
SQL> select * from t1 where to_number(idd)=11;
ID IDD
---------- ----------
1 11
Execution Plan
----------------------------------------------------------
Plan hash value: 1463967975
------------------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
------------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 1 | 33 | 2 (0)| 00:00:01 |
| 1 | TABLE ACCESS BY INDEX ROWID| T1 | 1 | 33 | 2 (0)| 00:00:01 |
|* 2 | INDEX RANGE SCAN | IDX_IDD_T1 | 1 | | 1 (0)| 00:00:01 |
------------------------------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
2 - access(TO_NUMBER("IDD")=11)
Note
-----
- dynamic sampling used for this statement (level=2)
SQL> select * from t1 where to_number(idd)=to_number('11');
ID IDD
---------- ----------
1 11
Execution Plan
----------------------------------------------------------
Plan hash value: 1463967975
------------------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
------------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 1 | 33 | 2 (0)| 00:00:01 |
| 1 | TABLE ACCESS BY INDEX ROWID| T1 | 1 | 33 | 2 (0)| 00:00:01 |
|* 2 | INDEX RANGE SCAN | IDX_IDD_T1 | 1 | | 1 (0)| 00:00:01 |
------------------------------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
2 - access(TO_NUMBER("IDD")=11)
Note
-----
- dynamic sampling used for this statement (level=2)
SQL> select * from t1 where to_number(idd)=to_number('11');
ID IDD
---------- ----------
1 11
Execution Plan
----------------------------------------------------------
Plan hash value: 1463967975
------------------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
------------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 1 | 33 | 2 (0)| 00:00:01 |
| 1 | TABLE ACCESS BY INDEX ROWID| T1 | 1 | 33 | 2 (0)| 00:00:01 |
|* 2 | INDEX RANGE SCAN | IDX_IDD_T1 | 1 | | 1 (0)| 00:00:01 |
------------------------------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
2 - access(TO_NUMBER("IDD")=11)
Note
-----
- dynamic sampling used for this statement (level=2)
