How to make only one < full analysis >

Hi all
I have the query as below and I see that she has produced 3 < TABLE ACCESS FULL > for each Union, how to operate with single scan? It's simple table 2 columns, no indexes or PK, just for example.
explain plan for
select count(*) from tt where amt between 0 and 100  union all
select       count(*) from tt where amt between 100 and 200  union all
select       count(*) from tt where amt >200  

----------------------------------------------------------------------------                                                                                                                                                                                                                                 
| Id  | Operation           | Name | Rows  | Bytes | Cost (%CPU)| Time     |                                                                                                                                                                                                                                 
----------------------------------------------------------------------------                                                                                                                                                                                                                                 
|   0 | SELECT STATEMENT    |      |     3 |    39 |     9  (67)| 00:00:01 |                                                                                                                                                                                                                                 
|   1 |  UNION-ALL          |      |       |       |            |          |                                                                                                                                                                                                                                 
|   2 |   SORT AGGREGATE    |      |     1 |    13 |            |          |                                                                                                                                                                                                                                 
|*  3 |    TABLE ACCESS FULL| TT   |     2 |    26 |     3   (0)| 00:00:01 |                                                                                                                                                                                                                                 
|   4 |   SORT AGGREGATE    |      |     1 |    13 |            |          |                                                                                                                                                                                                                                 
|*  5 |    TABLE ACCESS FULL| TT   |     3 |    39 |     3   (0)| 00:00:01 |                                                                                                                                                                                                                                 
|   6 |   SORT AGGREGATE    |      |     1 |    13 |            |          |                                                                                                                                                                                                                                 
|*  7 |    TABLE ACCESS FULL| TT   |     3 |    39 |     3   (0)| 00:00:01 |                                                                                                                                                                                                                                 
----------------------------------------------------------------------------                                                                                                                                                                                                                                 
                                                                                                                                                                                                                                                                                                             
Predicate Information (identified by operation id):                                                                                                                                                                                                                                                          
---------------------------------------------------                                                                                                                                                                                                                                                          
                                                                                                                                                                                                                                                                                                             
   3 - filter("AMT">=0 AND "AMT"<=100)                                                                                                                                                                                                                                                                       
   5 - filter("AMT">=100 AND "AMT"<=200)                                                                                                                                                                                                                                                                     
   7 - filter("AMT">200)                                                                                                                                                                                                                                                                                     
                                                                                                                                                                                                                                                                                                             
Note                                                                                                                                                                                                                                                                                                         
-----                                                                                                                                                                                                                                                                                                        
   - dynamic sampling used for this statement                                                                                                                                                                                                                                                                
SQL> explain plan for
  2  select count(*) from emp where sal between 0 and 100  union all
  3  select       count(*) from emp where sal between 100 and 200  union all
  4  select       count(*) from emp where sal > 200
  5  /

Explained.

SQL> @?\rdbms\admin\utlxpls

PLAN_TABLE_OUTPUT
-------------------------------------------------------------------------------------------------------------
Plan hash value: 3840822464

------------------------------------------------------------------------------
| Id  | Operation         | Name     | Rows  | Bytes | Cost (%CPU)| Time     |
------------------------------------------------------------------------------
|   0 | SELECT STATEMENT  |          |     3 |    12 |     3  (67)| 00:00:01 |
|   1 |  UNION-ALL        |          |       |       |            |          |
|   2 |   SORT AGGREGATE  |          |     1 |     4 |            |          |
|*  3 |    INDEX FULL SCAN| EMP_IDX3 |     1 |     4 |     1   (0)| 00:00:01 |
|   4 |   SORT AGGREGATE  |          |     1 |     4 |            |          |
|*  5 |    INDEX FULL SCAN| EMP_IDX3 |     1 |     4 |     1   (0)| 00:00:01 |

PLAN_TABLE_OUTPUT
-------------------------------------------------------------------------------------------------------------
|   6 |   SORT AGGREGATE  |          |     1 |     4 |            |          |
|*  7 |    INDEX FULL SCAN| EMP_IDX3 |    14 |    56 |     1   (0)| 00:00:01 |
------------------------------------------------------------------------------

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

   3 - access("SAL">=0 AND "SAL"<=100)
       filter("SAL"<=100 AND "SAL">=0)
   5 - access("SAL">=100 AND "SAL"<=200)
       filter("SAL"<=200 AND "SAL">=100)

PLAN_TABLE_OUTPUT
-------------------------------------------------------------------------------------------------------------
   7 - access("SAL">200)
       filter("SAL">200)

24 rows selected.

SQL> explain plan for
  2  with t as (
  3             select  count(case when sal between 0 and 100 then 1 end) cnt1,
  4                     count(case when sal between 100 and 200 then 1 end) cnt2,
  5                     count(case when sal > 200 then 1 end) cnt3
  6               from  emp
  7            )
  8  select cnt1 from t  union all
  9  select cnt2 from t  union all
 10  select cnt3 from t
 11  /

Explained.

SQL> @?\rdbms\admin\utlxpls

PLAN_TABLE_OUTPUT
-------------------------------------------------------------------------------------------------------------
Plan hash value: 2586840053

----------------------------------------------------------------------------------------------------------
| Id  | Operation                  | Name                        | Rows  | Bytes | Cost (%CPU)| Time     |
----------------------------------------------------------------------------------------------------------
|   0 | SELECT STATEMENT           |                             |     3 |    39 |     6  (67)| 00:00:01 |
|   1 |  TEMP TABLE TRANSFORMATION |                             |       |       |            |          |
|   2 |   LOAD AS SELECT           |                             |       |       |            |          |
|   3 |    SORT AGGREGATE          |                             |     1 |     4 |            |          |
|   4 |     TABLE ACCESS FULL      | EMP                         |    14 |    56 |     3   (0)| 00:00:01 |
|   5 |   UNION-ALL                |                             |       |       |            |          |

PLAN_TABLE_OUTPUT
-------------------------------------------------------------------------------------------------------------
|   6 |    VIEW                    |                             |     1 |    13 |     2   (0)| 00:00:01 |
|   7 |     TABLE ACCESS FULL      | SYS_TEMP_0FD9D662A_D5091620 |     1 |     4 |     2   (0)| 00:00:01 |
|   8 |    VIEW                    |                             |     1 |    13 |     2   (0)| 00:00:01 |
|   9 |     TABLE ACCESS FULL      | SYS_TEMP_0FD9D662A_D5091620 |     1 |     4 |     2   (0)| 00:00:01 |
|  10 |    VIEW                    |                             |     1 |    13 |     2   (0)| 00:00:01 |
|  11 |     TABLE ACCESS FULL      | SYS_TEMP_0FD9D662A_D5091620 |     1 |     4 |     2   (0)| 00:00:01 |
----------------------------------------------------------------------------------------------------------

18 rows selected.

SQL>

SY.

Tags: Database

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