Reg: Rownum

Hi Master,

I executed the query below... I had the result... then run another query (ofcourse even) but get the diff result set. Please explain to me... !!

SQL > Select rownum from emp;

1

2

3

4

5

6

7

8

9

10

11

12

13

14

14 selected, lines

SQL > select rownum separate from emp;

1

6

11

13

2

14

4

5

8

3

7

9

10

12

14 selected lines.

In the second query... What is going on.. why it does not appear in the order of the CSA? Please explain to me.

Concerning

AR

As Scott and Nick, Oracle uses a unique hash to generate the values of distinct rownum:

SQL > select rownum from scott.emp;

Execution plan

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

Hash value of plan: 3286312482

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

| ID | Operation | Name | Lines | Cost (% CPU). Time |

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

|  0 | SELECT STATEMENT |        |    14.    1 (0) | 00:00:01 |

|  1.  COUNTY |        |       |          |           |

|  2.  INDEX SCAN FULL | PK_EMP |    14.    1 (0) | 00:00:01 |

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

SQL > select rownum separate

2 from scott.emp;

Execution plan

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

Hash value of plan: 2421365613

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

| ID | Operation | Name | Lines | Cost (% CPU). Time |

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

|  0 | SELECT STATEMENT |        |    14.    2 (50) | 00:00:01 |

|  1.  UNIQUE HASH |        |    14.    2 (50) | 00:00:01 |

|  2.  COUNTY |        |       |           |          |

|  3.    INDEX SCAN FULL | PK_EMP |    14.    1 (0) | 00:00:01 |

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

Note the UNIQUE HASH in the second plan.  Essentially, it's what he does to get unique values (although the hashing used by the ora_hash algorithm seems to be different from the one used internally):

SQL > select rn, ora_hash (rn)

2 from (select rownum scott.emp rn)

3 order by 2;

RN ORA_HASH (RN)

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

5 365452098

7 738226831

6 1021760792

10 1237562873

12 1646821573

9 1706589901

2 2064090006

1 2342552567

11 2671099528

3 2706503459

14 2791491783

13 3006123492

4 3217185531

8 3510633070

John

Tags: Database

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