首页 > 代码库 > 【测试】使用hr用户下的employees和departments表写一条SQL语句，(MG连接)
【测试】使用hr用户下的employees和departments表写一条SQL语句，(MG连接)
SQL> select * from employees d, departments t where d.department_id=t.department_id;
106 rows selected.
Execution Plan
----------------------------------------------------------
Plan hash value: 1343509718
--------------------------------------------------------------------------------
------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)
| Time |
--------------------------------------------------------------------------------
------------
| 0 | SELECT STATEMENT | | 106 | 9540 | 6 (17)
| 00:00:01 |
| 1 | MERGE JOIN | | 106 | 9540 | 6 (17)
| 00:00:01 |
| 2 | TABLE ACCESS BY INDEX ROWID| DEPARTMENTS | 27 | 567 | 2 (0)
| 00:00:01 |
| 3 | INDEX FULL SCAN | DEPT_ID_PK | 27 | | 1 (0)
| 00:00:01 |
|* 4 | SORT JOIN | | 107 | 7383 | 4 (25)
| 00:00:01 |
| 5 | TABLE ACCESS FULL | EMPLOYEES | 107 | 7383 | 3 (0)
| 00:00:01 |
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Predicate Information (identified by operation id):
---------------------------------------------------
4 - access("D"."DEPARTMENT_ID"="T"."DEPARTMENT_ID")
filter("D"."DEPARTMENT_ID"="T"."DEPARTMENT_ID")
Statistics
----------------------------------------------------------
8 recursive calls
0 db block gets
20 consistent gets
0 physical reads
【测试】使用hr用户下的employees和departments表写一条SQL语句，(MG连接)
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