oracle 表 的 join 方式-1
2014-10-01 21:26
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SQL> select /*+ ordered use_nl ( e d)*/ d.dname,e.deptno,e.ename from emp_sys e,dept_sys d where e.deptno=d.deptno;
DNAME DEPTNO ENAME
-------------- ---------- ----------
RESEARCH 20 SMITH
SALES 30 ALLEN
SALES 30 WARD
RESEARCH 20 JONES
SALES 30 MARTIN
SALES 30 BLAKE
ACCOUNTING 10 CLARK
RESEARCH 20 SCOTT
ACCOUNTING 10 KING
SALES 30 TURNER
RESEARCH 20 ADAMS
SALES 30 JAMES
RESEARCH 20 FORD
ACCOUNTING 10 MILLER
已选择14行。
执行计划
----------------------------------------------------------
Plan hash value: 3319758173
-------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
-------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 14 | 588 | 8 (0)| 00:00:01 |
| 1 | NESTED LOOPS | | 14 | 588 | 8 (0)| 00:00:01 |
| 2 | TABLE ACCESS FULL| EMP_SYS | 14 | 280 | 2 (0)| 00:00:01 |
|* 3 | TABLE ACCESS FULL| DEPT_SYS | 1 | 22 | 0 (0)| 00:00:01 |
-------------------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
3 - filter("E"."DEPTNO"="D"."DEPTNO")
Note
-----
- dynamic sampling used for this statement (level=2)
统计信息
----------------------------------------------------------
0 recursive calls
0 db block gets
47 consistent gets
0 physical reads
0 redo size
853 bytes sent via SQL*Net to client
415 bytes received via SQL*Net from client
2 SQL*Net roundtrips to/from client
0 sorts (memory)
0 sorts (disk)
14 rows processed
SQL> select /*+ use_nl ( e d)*/ d.dname,e.deptno,e.ename from emp_sys e,dept_sys d where e.deptno=d.deptno;
DNAME DEPTNO ENAME
-------------- ---------- ----------
ACCOUNTING 10 CLARK
ACCOUNTING 10 KING
ACCOUNTING 10 MILLER
RESEARCH 20 SMITH
RESEARCH 20 JONES
RESEARCH 20 SCOTT
RESEARCH 20 ADAMS
RESEARCH 20 FORD
SALES 30 ALLEN
SALES 30 WARD
SALES 30 MARTIN
SALES 30 BLAKE
SALES 30 TURNER
SALES 30 JAMES
已选择14行。
执行计划
----------------------------------------------------------
Plan hash value: 1972627781
-------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
-------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 14 | 588 | 5 (0)| 00:00:01 |
| 1 | NESTED LOOPS | | 14 | 588 | 5 (0)| 00:00:01 |
| 2 | TABLE ACCESS FULL| DEPT_SYS | 4 | 88 | 2 (0)| 00:00:01 |--与上面相比驱动表变成了[b]DEPT_SYS ,差在order.[/b]
|* 3 | TABLE ACCESS FULL| EMP_SYS | 4 | 80 | 1 (0)| 00:00:01 |
-------------------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
3 - filter("E"."DEPTNO"="D"."DEPTNO")
Note
-----
- dynamic sampling used for this statement (level=2)
统计信息
----------------------------------------------------------
7 recursive calls
0 db block gets
25 consistent gets
0 physical reads
0 redo size
764 bytes sent via SQL*Net to client
415 bytes received via SQL*Net from client
2 SQL*Net roundtrips to/from client
2 sorts (memory)
0 sorts (disk)
14 rows processed
=============================================================================================================
SQL> select /*+ ordered use_nl ( e d)*/ d.dname,e.deptno,e.ename from emp_sys e,dept_sys d where e.deptno=d.deptno;
DNAME DEPTNO ENAME
-------------- ---------- ----------
RESEARCH 20 SMITH
SALES 30 ALLEN
SALES 30 WARD
RESEARCH 20 JONES
SALES 30 MARTIN
SALES 30 BLAKE
ACCOUNTING 10 CLARK
RESEARCH 20 SCOTT
ACCOUNTING 10 KING
SALES 30 TURNER
RESEARCH 20 ADAMS
SALES 30 JAMES
RESEARCH 20 FORD
ACCOUNTING 10 MILLER
已选择14行。
执行计划
----------------------------------------------------------
Plan hash value: 3319758173
------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
-------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 14 | 588 | 8 (0)| 00:00:01 |
| 1 | NESTED LOOPS | | 14 | 588 | 8 (0)| 00:00:01 |
| 2 | TABLE ACCESS FULL| EMP_SYS | 14 | 280 | 2 (0)| 00:00:01 |
|* 3 | TABLE ACCESS FULL| DEPT_SYS | 1 | 22 | 0 (0)| 00:00:01 |
-------------------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
3 - filter("E"."DEPTNO"="D"."DEPTNO")
Note
-----
- dynamic sampling used for this statement (level=2)
统计信息
----------------------------------------------------------
0 recursive calls
0 db block gets
47 consistent gets
0 physical reads
0 redo size
853 bytes sent via SQL*Net to client
415 bytes received via SQL*Net from client
2 SQL*Net roundtrips to/from client
0 sorts (memory)
0 sorts (disk)
14 rows processed
SQL>
SQL> select e.deptno,e.ename from emp_sys e where e.deptno not in(select deptno from dept_sys);
未选定行
执行计划
----------------------------------------------------------
Plan hash value: 3477241526
-------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
-------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 14 | 462 | 5 (20)| 00:00:01 |
|* 1 | HASH JOIN ANTI NA | | 14 | 462 | 5 (20)| 00:00:01 |---NA 什么意思不知道？？？？？
| 2 | TABLE ACCESS FULL| EMP_SYS | 14 | 280 | 2 (0)| 00:00:01 |
| 3 | TABLE ACCESS FULL| DEPT_SYS | 4 | 52 | 2 (0)| 00:00:01 |
-------------------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
1 - access("E"."DEPTNO"="DEPTNO")
Note
-----
- dynamic sampling used for this statement (level=2)
统计信息
----------------------------------------------------------
0 recursive calls
0 db block gets
6 consistent gets
0 physical reads
0 redo size
346 bytes sent via SQL*Net to client
404 bytes received via SQL*Net from client
1 SQL*Net roundtrips to/from client
0 sorts (memory)
0 sorts (disk)
0 rows processed
SQL> select e.deptno,e.ename from emp_sys e where e.deptno not in(select /*+ merge_aj */deptno from dept_sys);
未选定行
执行计划
----------------------------------------------------------
Plan hash value: 3477241526
-------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
-------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 14 | 462 | 5 (20)| 00:00:01 |
|* 1 | HASH JOIN ANTI NA | | 14 | 462 | 5 (20)| 00:00:01 | ---NA 什么意思不知道？？？？？
| 2 | TABLE ACCESS FULL| EMP_SYS | 14 | 280 | 2 (0)| 00:00:01 |
| 3 | TABLE ACCESS FULL| DEPT_SYS | 4 | 52 | 2 (0)| 00:00:01 |
-------------------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
1 - access("E"."DEPTNO"="DEPTNO")
Note
-----
- dynamic sampling used for this statement (level=2)
统计信息
----------------------------------------------------------
7 recursive calls
0 db block gets
14 consistent gets
0 physical reads
0 redo size
346 bytes sent via SQL*Net to client
404 bytes received via SQL*Net from client
1 SQL*Net roundtrips to/from client
2 sorts (memory)
0 sorts (disk)
0 rows processed
SQL>
SQL> alter table emp_sys modify(deptno not null);
表已更改。
SQL> alter table dept_sys modify(deptno not null);
表已更改。
SQL> select e.deptno,e.ename from emp_sys e where e.deptno
not in(select /*+ MERGE_AJ */ deptno from dept_sys);
未选定行
执行计划
----------------------------------------------------------
Plan hash value: 3084791470
--------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
--------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 14 | 462 | 6 (34)| 00:00:01 |
| 1 | MERGE JOIN ANTI | | 14 | 462 | 6 (34)| 00:00:01 |-----终于实现了排序合并反连接...
| 2 | SORT JOIN | | 14 | 280 | 3 (34)| 00:00:01 |
| 3 | TABLE ACCESS FULL| EMP_SYS | 14 | 280 | 2 (0)| 00:00:01 |
|* 4 | SORT UNIQUE | | 4 | 52 | 3 (34)| 00:00:01 |
| 5 | TABLE ACCESS FULL| DEPT_SYS | 4 | 52 | 2 (0)| 00:00:01 |
--------------------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
4 - access("E"."DEPTNO"="DEPTNO")
filter("E"."DEPTNO"="DEPTNO")
Note
-----
- dynamic sampling used for this statement (level=2)
统计信息
----------------------------------------------------------
231 recursive calls
0 db block gets
36 consistent gets
0 physical reads
0 redo size
346 bytes sent via SQL*Net to client
404 bytes received via SQL*Net from client
1 SQL*Net roundtrips to/from client
8 sorts (memory)
0 sorts (disk)
0 rows processed
SQL> select e.deptno,e.ename from emp_sys e where e.deptno not in(select deptno from dept_sys);
未选定行
执行计划
----------------------------------------------------------
Plan hash value: 305931308
-------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
-------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 14 | 462 | 5 (20)| 00:00:01 |
|* 1 | HASH JOIN ANTI | | 14 | 462 | 5 (20)| 00:00:01 |---NA终于没有了，而且实现了哈希反连接...
| 2 | TABLE ACCESS FULL| EMP_SYS | 14 | 280 | 2 (0)| 00:00:01 |
| 3 | TABLE ACCESS FULL| DEPT_SYS | 4 | 52 | 2 (0)| 00:00:01 |
-------------------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
1 - access("E"."DEPTNO"="DEPTNO")
Note
-----
- dynamic sampling used for this statement (level=2)
统计信息
----------------------------------------------------------
7 recursive calls
0 db block gets
14 consistent gets
0 physical reads
0 redo size
346 bytes sent via SQL*Net to client
404 bytes received via SQL*Net from client
1 SQL*Net roundtrips to/from client
2 sorts (memory)
0 sorts (disk)
0 rows processed
SQL>
SQL> select e.deptno,e.ename from emp_sys e where e.deptno not in(select /*+ MERGE_AJ */ deptno from dept_sys);
未选定行
执行计划
----------------------------------------------------------
Plan hash value: 3084791470
--------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
--------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 14 | 462 | 6 (34)| 00:00:01 |
| 1 | MERGE JOIN ANTI | | 14 | 462 | 6 (34)| 00:00:01 |
| 2 | SORT JOIN | | 14 | 280 | 3 (34)| 00:00:01 |
| 3 | TABLE ACCESS FULL| EMP_SYS | 14 | 280 | 2 (0)| 00:00:01 |
|* 4 | SORT UNIQUE | | 4 | 52 | 3 (34)| 00:00:01 |
| 5 | TABLE ACCESS FULL| DEPT_SYS | 4 | 52 | 2 (0)| 00:00:01 |
--------------------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
4 - access("E"."DEPTNO"="DEPTNO")
filter("E"."DEPTNO"="DEPTNO")
Note
-----
- dynamic sampling used for this statement (level=2)
统计信息
----------------------------------------------------------
0 recursive calls
0 db block gets
6 consistent gets
0 physical reads
0 redo size
346 bytes sent via SQL*Net to client
404 bytes received via SQL*Net from client
1 SQL*Net roundtrips to/from client
2 sorts (memory)
0 sorts (disk)
0 rows processed
SQL> select e.deptno,e.ename from emp_sys e where e.deptno
not in(select /*+ nl_aj */ deptno from dept_sys);
未选定行
执行计划
----------------------------------------------------------
Plan hash value: 4115224242
-------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
-------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 14 | 462 | 8 (0)| 00:00:01 |
| 1 | NESTED LOOPS ANTI | | 14 | 462 | 8 (0)| 00:00:01 |-----实现了嵌套循环反连接...
| 2 | TABLE ACCESS FULL| EMP_SYS | 14 | 280 | 2 (0)| 00:00:01 |
|* 3 | TABLE ACCESS FULL| DEPT_SYS | 1 | 13 | 0 (0)| 00:00:01 |
-------------------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
3 - filter("E"."DEPTNO"="DEPTNO")
Note
-----
- dynamic sampling used for this statement (level=2)
统计信息
----------------------------------------------------------
7 recursive calls
0 db block gets
20 consistent gets
0 physical reads
0 redo size
346 bytes sent via SQL*Net to client
404 bytes received via SQL*Net from client
1 SQL*Net roundtrips to/from client
2 sorts (memory)
0 sorts (disk)
0 rows processed
SQL>
DNAME DEPTNO ENAME
-------------- ---------- ----------
RESEARCH 20 SMITH
SALES 30 ALLEN
SALES 30 WARD
RESEARCH 20 JONES
SALES 30 MARTIN
SALES 30 BLAKE
ACCOUNTING 10 CLARK
RESEARCH 20 SCOTT
ACCOUNTING 10 KING
SALES 30 TURNER
RESEARCH 20 ADAMS
SALES 30 JAMES
RESEARCH 20 FORD
ACCOUNTING 10 MILLER
已选择14行。
执行计划
----------------------------------------------------------
Plan hash value: 3319758173
-------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
-------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 14 | 588 | 8 (0)| 00:00:01 |
| 1 | NESTED LOOPS | | 14 | 588 | 8 (0)| 00:00:01 |
| 2 | TABLE ACCESS FULL| EMP_SYS | 14 | 280 | 2 (0)| 00:00:01 |
|* 3 | TABLE ACCESS FULL| DEPT_SYS | 1 | 22 | 0 (0)| 00:00:01 |
-------------------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
3 - filter("E"."DEPTNO"="D"."DEPTNO")
Note
-----
- dynamic sampling used for this statement (level=2)
统计信息
----------------------------------------------------------
0 recursive calls
0 db block gets
47 consistent gets
0 physical reads
0 redo size
853 bytes sent via SQL*Net to client
415 bytes received via SQL*Net from client
2 SQL*Net roundtrips to/from client
0 sorts (memory)
0 sorts (disk)
14 rows processed
SQL> select /*+ use_nl ( e d)*/ d.dname,e.deptno,e.ename from emp_sys e,dept_sys d where e.deptno=d.deptno;
DNAME DEPTNO ENAME
-------------- ---------- ----------
ACCOUNTING 10 CLARK
ACCOUNTING 10 KING
ACCOUNTING 10 MILLER
RESEARCH 20 SMITH
RESEARCH 20 JONES
RESEARCH 20 SCOTT
RESEARCH 20 ADAMS
RESEARCH 20 FORD
SALES 30 ALLEN
SALES 30 WARD
SALES 30 MARTIN
SALES 30 BLAKE
SALES 30 TURNER
SALES 30 JAMES
已选择14行。
执行计划
----------------------------------------------------------
Plan hash value: 1972627781
-------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
-------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 14 | 588 | 5 (0)| 00:00:01 |
| 1 | NESTED LOOPS | | 14 | 588 | 5 (0)| 00:00:01 |
| 2 | TABLE ACCESS FULL| DEPT_SYS | 4 | 88 | 2 (0)| 00:00:01 |--与上面相比驱动表变成了[b]DEPT_SYS ,差在order.[/b]
|* 3 | TABLE ACCESS FULL| EMP_SYS | 4 | 80 | 1 (0)| 00:00:01 |
-------------------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
3 - filter("E"."DEPTNO"="D"."DEPTNO")
Note
-----
- dynamic sampling used for this statement (level=2)
统计信息
----------------------------------------------------------
7 recursive calls
0 db block gets
25 consistent gets
0 physical reads
0 redo size
764 bytes sent via SQL*Net to client
415 bytes received via SQL*Net from client
2 SQL*Net roundtrips to/from client
2 sorts (memory)
0 sorts (disk)
14 rows processed
=============================================================================================================
SQL> select /*+ ordered use_nl ( e d)*/ d.dname,e.deptno,e.ename from emp_sys e,dept_sys d where e.deptno=d.deptno;
DNAME DEPTNO ENAME
-------------- ---------- ----------
RESEARCH 20 SMITH
SALES 30 ALLEN
SALES 30 WARD
RESEARCH 20 JONES
SALES 30 MARTIN
SALES 30 BLAKE
ACCOUNTING 10 CLARK
RESEARCH 20 SCOTT
ACCOUNTING 10 KING
SALES 30 TURNER
RESEARCH 20 ADAMS
SALES 30 JAMES
RESEARCH 20 FORD
ACCOUNTING 10 MILLER
已选择14行。
执行计划
----------------------------------------------------------
Plan hash value: 3319758173
------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
-------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 14 | 588 | 8 (0)| 00:00:01 |
| 1 | NESTED LOOPS | | 14 | 588 | 8 (0)| 00:00:01 |
| 2 | TABLE ACCESS FULL| EMP_SYS | 14 | 280 | 2 (0)| 00:00:01 |
|* 3 | TABLE ACCESS FULL| DEPT_SYS | 1 | 22 | 0 (0)| 00:00:01 |
-------------------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
3 - filter("E"."DEPTNO"="D"."DEPTNO")
Note
-----
- dynamic sampling used for this statement (level=2)
统计信息
----------------------------------------------------------
0 recursive calls
0 db block gets
47 consistent gets
0 physical reads
0 redo size
853 bytes sent via SQL*Net to client
415 bytes received via SQL*Net from client
2 SQL*Net roundtrips to/from client
0 sorts (memory)
0 sorts (disk)
14 rows processed
SQL>
SQL> select e.deptno,e.ename from emp_sys e where e.deptno not in(select deptno from dept_sys);
未选定行
执行计划
----------------------------------------------------------
Plan hash value: 3477241526
-------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
-------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 14 | 462 | 5 (20)| 00:00:01 |
|* 1 | HASH JOIN ANTI NA | | 14 | 462 | 5 (20)| 00:00:01 |---NA 什么意思不知道？？？？？
| 2 | TABLE ACCESS FULL| EMP_SYS | 14 | 280 | 2 (0)| 00:00:01 |
| 3 | TABLE ACCESS FULL| DEPT_SYS | 4 | 52 | 2 (0)| 00:00:01 |
-------------------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
1 - access("E"."DEPTNO"="DEPTNO")
Note
-----
- dynamic sampling used for this statement (level=2)
统计信息
----------------------------------------------------------
0 recursive calls
0 db block gets
6 consistent gets
0 physical reads
0 redo size
346 bytes sent via SQL*Net to client
404 bytes received via SQL*Net from client
1 SQL*Net roundtrips to/from client
0 sorts (memory)
0 sorts (disk)
0 rows processed
SQL> select e.deptno,e.ename from emp_sys e where e.deptno not in(select /*+ merge_aj */deptno from dept_sys);
未选定行
执行计划
----------------------------------------------------------
Plan hash value: 3477241526
-------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
-------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 14 | 462 | 5 (20)| 00:00:01 |
|* 1 | HASH JOIN ANTI NA | | 14 | 462 | 5 (20)| 00:00:01 | ---NA 什么意思不知道？？？？？
| 2 | TABLE ACCESS FULL| EMP_SYS | 14 | 280 | 2 (0)| 00:00:01 |
| 3 | TABLE ACCESS FULL| DEPT_SYS | 4 | 52 | 2 (0)| 00:00:01 |
-------------------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
1 - access("E"."DEPTNO"="DEPTNO")
Note
-----
- dynamic sampling used for this statement (level=2)
统计信息
----------------------------------------------------------
7 recursive calls
0 db block gets
14 consistent gets
0 physical reads
0 redo size
346 bytes sent via SQL*Net to client
404 bytes received via SQL*Net from client
1 SQL*Net roundtrips to/from client
2 sorts (memory)
0 sorts (disk)
0 rows processed
SQL>
SQL> alter table emp_sys modify(deptno not null);
表已更改。
SQL> alter table dept_sys modify(deptno not null);
表已更改。
SQL> select e.deptno,e.ename from emp_sys e where e.deptno
not in(select /*+ MERGE_AJ */ deptno from dept_sys);
未选定行
执行计划
----------------------------------------------------------
Plan hash value: 3084791470
--------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
--------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 14 | 462 | 6 (34)| 00:00:01 |
| 1 | MERGE JOIN ANTI | | 14 | 462 | 6 (34)| 00:00:01 |-----终于实现了排序合并反连接...
| 2 | SORT JOIN | | 14 | 280 | 3 (34)| 00:00:01 |
| 3 | TABLE ACCESS FULL| EMP_SYS | 14 | 280 | 2 (0)| 00:00:01 |
|* 4 | SORT UNIQUE | | 4 | 52 | 3 (34)| 00:00:01 |
| 5 | TABLE ACCESS FULL| DEPT_SYS | 4 | 52 | 2 (0)| 00:00:01 |
--------------------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
4 - access("E"."DEPTNO"="DEPTNO")
filter("E"."DEPTNO"="DEPTNO")
Note
-----
- dynamic sampling used for this statement (level=2)
统计信息
----------------------------------------------------------
231 recursive calls
0 db block gets
36 consistent gets
0 physical reads
0 redo size
346 bytes sent via SQL*Net to client
404 bytes received via SQL*Net from client
1 SQL*Net roundtrips to/from client
8 sorts (memory)
0 sorts (disk)
0 rows processed
SQL> select e.deptno,e.ename from emp_sys e where e.deptno not in(select deptno from dept_sys);
未选定行
执行计划
----------------------------------------------------------
Plan hash value: 305931308
-------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
-------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 14 | 462 | 5 (20)| 00:00:01 |
|* 1 | HASH JOIN ANTI | | 14 | 462 | 5 (20)| 00:00:01 |---NA终于没有了，而且实现了哈希反连接...
| 2 | TABLE ACCESS FULL| EMP_SYS | 14 | 280 | 2 (0)| 00:00:01 |
| 3 | TABLE ACCESS FULL| DEPT_SYS | 4 | 52 | 2 (0)| 00:00:01 |
-------------------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
1 - access("E"."DEPTNO"="DEPTNO")
Note
-----
- dynamic sampling used for this statement (level=2)
统计信息
----------------------------------------------------------
7 recursive calls
0 db block gets
14 consistent gets
0 physical reads
0 redo size
346 bytes sent via SQL*Net to client
404 bytes received via SQL*Net from client
1 SQL*Net roundtrips to/from client
2 sorts (memory)
0 sorts (disk)
0 rows processed
SQL>
SQL> select e.deptno,e.ename from emp_sys e where e.deptno not in(select /*+ MERGE_AJ */ deptno from dept_sys);
未选定行
执行计划
----------------------------------------------------------
Plan hash value: 3084791470
--------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
--------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 14 | 462 | 6 (34)| 00:00:01 |
| 1 | MERGE JOIN ANTI | | 14 | 462 | 6 (34)| 00:00:01 |
| 2 | SORT JOIN | | 14 | 280 | 3 (34)| 00:00:01 |
| 3 | TABLE ACCESS FULL| EMP_SYS | 14 | 280 | 2 (0)| 00:00:01 |
|* 4 | SORT UNIQUE | | 4 | 52 | 3 (34)| 00:00:01 |
| 5 | TABLE ACCESS FULL| DEPT_SYS | 4 | 52 | 2 (0)| 00:00:01 |
--------------------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
4 - access("E"."DEPTNO"="DEPTNO")
filter("E"."DEPTNO"="DEPTNO")
Note
-----
- dynamic sampling used for this statement (level=2)
统计信息
----------------------------------------------------------
0 recursive calls
0 db block gets
6 consistent gets
0 physical reads
0 redo size
346 bytes sent via SQL*Net to client
404 bytes received via SQL*Net from client
1 SQL*Net roundtrips to/from client
2 sorts (memory)
0 sorts (disk)
0 rows processed
SQL> select e.deptno,e.ename from emp_sys e where e.deptno
not in(select /*+ nl_aj */ deptno from dept_sys);
未选定行
执行计划
----------------------------------------------------------
Plan hash value: 4115224242
-------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
-------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 14 | 462 | 8 (0)| 00:00:01 |
| 1 | NESTED LOOPS ANTI | | 14 | 462 | 8 (0)| 00:00:01 |-----实现了嵌套循环反连接...
| 2 | TABLE ACCESS FULL| EMP_SYS | 14 | 280 | 2 (0)| 00:00:01 |
|* 3 | TABLE ACCESS FULL| DEPT_SYS | 1 | 13 | 0 (0)| 00:00:01 |
-------------------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
3 - filter("E"."DEPTNO"="DEPTNO")
Note
-----
- dynamic sampling used for this statement (level=2)
统计信息
----------------------------------------------------------
7 recursive calls
0 db block gets
20 consistent gets
0 physical reads
0 redo size
346 bytes sent via SQL*Net to client
404 bytes received via SQL*Net from client
1 SQL*Net roundtrips to/from client
2 sorts (memory)
0 sorts (disk)
0 rows processed
SQL>
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