where t.trans_date=date'2018-06-07'; 等价于 ("T"."TRANS_DATE"=TO_DATE(' 2018-06-07 00:00:00', 'syyyy-m

explain plan for select *
  from esb2_trans_log t
 where t.trans_date >= 
       to_date('2018-06-07 00:00:00', 'yyyy-mm-dd hh24:mi:ss') 
   and t.trans_date <= 
       to_date('2018-06-07 23:59:59', 'yyyy-mm-dd hh24:mi:ss') ;
       
   select * from table(dbms_xplan.display());
   
    PLAN_TABLE_OUTPUT
1 Plan hash value: 1868862569
2  
3 ---------------------------------------------------------------------------------------------------------
4 | Id  | Operation              | Name           | Rows  | Bytes | Cost (%CPU)| Time     | Pstart| Pstop |
5 ---------------------------------------------------------------------------------------------------------
6 |   0 | SELECT STATEMENT       |                |    17M|  3526M|   150K  (1)| 00:30:06 |       |       |
7 |   1 |  PARTITION RANGE SINGLE|                |    17M|  3526M|   150K  (1)| 00:30:06 |     6 |     6 |
8 |*  2 |   TABLE ACCESS FULL    | ESB2_TRANS_LOG |    17M|  3526M|   150K  (1)| 00:30:06 |     6 |     6 |
9 ---------------------------------------------------------------------------------------------------------
10  
11 Predicate Information (identified by operation id):
12 ---------------------------------------------------
13  
14  2 - filter("T"."TRANS_DATE"<=TO_DATE(' 2018-06-07 23:59:59', 'syyyy-mm-dd hh24:mi:ss'))




explain plan for  
 select * from esb2_trans_log t
 where t.trans_date=date'2018-06-07';
       
   select * from table(dbms_xplan.display());
   
      PLAN_TABLE_OUTPUT
1 Plan hash value: 1868862569
2  
3 ---------------------------------------------------------------------------------------------------------
4 | Id  | Operation              | Name           | Rows  | Bytes | Cost (%CPU)| Time     | Pstart| Pstop |
5 ---------------------------------------------------------------------------------------------------------
6 |   0 | SELECT STATEMENT       |                |   222 | 46620 |   150K  (1)| 00:30:05 |       |       |
7 |   1 |  PARTITION RANGE SINGLE|                |   222 | 46620 |   150K  (1)| 00:30:05 |     6 |     6 |
8 |*  2 |   TABLE ACCESS FULL    | ESB2_TRANS_LOG |   222 | 46620 |   150K  (1)| 00:30:05 |     6 |     6 |
9 ---------------------------------------------------------------------------------------------------------
10  
11 Predicate Information (identified by operation id):
12 ---------------------------------------------------
13  
14  2 - filter("T"."TRANS_DATE"=TO_DATE(' 2018-06-07 00:00:00', 'syyyy-mm-dd hh24:mi:ss'))




where t.trans_date=date'2018-06-07';  等价于 ("T"."TRANS_DATE"=TO_DATE(' 2018-06-07 00:00:00', 'syyyy-mm-dd hh24:mi:ss'))