【测试】在hr用户下自行创建T1和T2表写一条SQL语句，（NL连接）

SQL> select t1.* from t1,t2 where t1.object_id=t2.object_id;

99 rows selected.

Execution Plan
----------------------------------------------------------
Plan hash value: 1506669289

--------------------------------------------------------------------------------
-------

| Id  | Operation                    | Name   | Rows  | Bytes | Cost (%CPU)| Tim
e     |

--------------------------------------------------------------------------------
-------

|   0 | SELECT STATEMENT             |        |    99 | 16929 |   201   (0)| 00:
00:03 |

|   1 |  NESTED LOOPS                |        |    99 | 16929 |   201   (0)| 00:
00:03 |

|   2 |   NESTED LOOPS               |        |    99 | 16929 |   201   (0)| 00:
00:03 |

|   3 |    TABLE ACCESS FULL         | T2     |    99 |  1287 |     3   (0)| 00:
00:01 |

|*  4 |    INDEX RANGE SCAN          | IDX_T1 |     1 |       |     1   (0)| 00:
00:01 |

|   5 |   TABLE ACCESS BY INDEX ROWID| T1     |     1 |   158 |     2   (0)| 00:
00:01 |

--------------------------------------------------------------------------------
-------

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

   4 - access("T1"."OBJECT_ID"="T2"."OBJECT_ID")

Note
-----
   - dynamic sampling used for this statement (level=2)

Statistics
----------------------------------------------------------
          8  recursive calls
          0  db block gets
        135  consistent gets
          4  physical reads
          0  redo size
       6108  bytes sent via SQL*Net to client
        589  bytes received via SQL*Net from client
          8  SQL*Net roundtrips to/from client
          0  sorts (memory)
          0  sorts (disk)
         99  rows processed