谁能解释一下执行计划和解释计划之间的区别。
当我执行
set autotrace traceonly;
select * from emp where empno=7369;
Execution Plan
----------------------------------------------------------
0 SELECT STATEMENT Optimizer Mode=ALL_ROWS (Cost=1 Card=1 Bytes=38)
1 0 TABLE ACCESS BY INDEX ROWID SCOTT.EMP (Cost=1 Card=1 Bytes=38)
2 1 INDEX UNIQUE SCAN SCOTT.PK_EMP (Cost=0 Card=1)
Explain Plan
explain plan for select * from emp where empno=7369;
select * from table(dbms_xplan.display);
Plan hash value: 2949544139
--------------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
--------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 1 | 38 | 1 (0)| 00:00:01 |
| 1 | TABLE ACCESS BY INDEX ROWID| EMP | 1 | 38 | 1 (0)| 00:00:01 |
|* 2 | INDEX UNIQUE SCAN | PK_EMP | 1 | | 0 (0)| 00:00:01 |
--------------------------------------------------------------------------------------
我得到相同的输出，那么两者之间有什么区别。