Silly old fogey (me) cannot figure out why this query returns 1 row

Hi all,
In reference to {thread:id=2456973}, why does
select sum(count(decode(job, 'CLERK', 1, null))) CLERKS
, sum(count(decode(job, 'SALESMAN', 1, null))) SALESMANS
from emp group by job;only return 1 row and not 1 for each job? I actually had to test it myself to believe it.
It returns data as if the query were
select sum(CLERKS), sum(SALESMANS)
from (select count(decode(job, 'CLERK', 1, null)) CLERKS, count(decode(job, 'SALESMAN', 1, null)) SALESMANS
         from emp group by job)Using only a single aggregate (either count or sum) returns 1 row per job, as expected

John Stegeman wrote:
It returns data as if the query were
select sum(CLERKS), sum(SALESMANS)
from (select count(decode(job, 'CLERK', 1, null)) CLERKS, count(decode(job, 'SALESMAN', 1, null)) SALESMANS
from emp group by job)
Exactly the point ;-)
Seems like Oracle actually can do a "double group by" in the same operation.
Witness the explain plans in this example:
SQL> select count(decode(job, 'CLERK', 1, null)) CLERKS
  2       , count(decode(job, 'SALESMAN', 1, null)) SALESMANS
  3  from scott.emp group by job;
    CLERKS  SALESMANS
         0          0
         0          0
         0          0
         0          4
         4          0
Execution Plan
Plan hash value: 1697595674
| Id  | Operation          | Name | Rows  | Bytes | Cost (%CPU)| Time     |
|   0 | SELECT STATEMENT   |      |     5 |    40 |     4  (25)| 00:00:01 |
|   1 |  HASH GROUP BY     |      |     5 |    40 |     4  (25)| 00:00:01 |
|   2 |   TABLE ACCESS FULL| EMP  |    14 |   112 |     3   (0)| 00:00:01 |
---------------------------------------------------------------------------And compare it to this one with the double aggregates:
SQL> select sum(count(decode(job, 'CLERK', 1, null))) CLERKS
  2       , sum(count(decode(job, 'SALESMAN', 1, null))) SALESMANS
  3  from scott.emp group by job;
    CLERKS  SALESMANS
         4          4
Execution Plan
Plan hash value: 417468012
| Id  | Operation           | Name | Rows  | Bytes | Cost (%CPU)| Time     |
|   0 | SELECT STATEMENT    |      |     1 |     8 |     4  (25)| 00:00:01 |
|   1 |  SORT AGGREGATE     |      |     1 |     8 |     4  (25)| 00:00:01 |
|   2 |   HASH GROUP BY     |      |     1 |     8 |     4  (25)| 00:00:01 |
|   3 |    TABLE ACCESS FULL| EMP  |    14 |   112 |     3   (0)| 00:00:01 |
----------------------------------------------------------------------------There is both HASH GROUP BY and SORT AGGREGATE.
It does not really make sense to do an aggregate on an aggregate - if both aggregates are used "on the same group-by level".
The sum() aggregates are used upon an already aggregated value, so it does look like Oracle actually treats that as "first do the inner aggregate using the specified group by and then do the outer aggregate on the result with no group by."
Look at this example where I combine "double" aggregates with "single" aggregates:
SQL> select sum(count(decode(job, 'CLERK', 1, null))) CLERKS
  2       , sum(count(decode(job, 'SALESMAN', 1, null))) SALESMANS
  3       , count(decode(job, 'SALESMAN', 1, null)) SALESMANS2
  4       , count(*) COUNTS
  5  from scott.emp group by job;
    CLERKS  SALESMANS SALESMANS2     COUNTS
         4          4          1          5
Execution Plan
Plan hash value: 417468012
| Id  | Operation           | Name | Rows  | Bytes | Cost (%CPU)| Time     |
|   0 | SELECT STATEMENT    |      |     1 |     8 |     4  (25)| 00:00:01 |
|   1 |  SORT AGGREGATE     |      |     1 |     8 |     4  (25)| 00:00:01 |
|   2 |   HASH GROUP BY     |      |     1 |     8 |     4  (25)| 00:00:01 |
|   3 |    TABLE ACCESS FULL| EMP  |    14 |   112 |     3   (0)| 00:00:01 |
----------------------------------------------------------------------------When mixing "double" and "single" aggregates, Oracle decides that single aggregates belong in the "outer" aggregation.
SALESMAN2 is doing a count on the aggregated job column that is the result of the "inner" group by - therefore only 1.
The count(*) also counts the result of the "inner" aggregation.
I am not sure if this is documented or if it is a "sideeffect" of either the internal code used for GROUPING SETS or the internal code used for allowing analytic functions like this:
SQL> select count(decode(job, 'CLERK', 1, null)) CLERKS
  2       , count(decode(job, 'SALESMAN', 1, null)) SALESMANS
  3       , sum(count(decode(job, 'CLERK', 1, null))) over () CLERKS2
  4       , sum(count(decode(job, 'SALESMAN', 1, null))) over () SALESMANS2
  5  from scott.emp group by job;
    CLERKS  SALESMANS    CLERKS2 SALESMANS2
         0          0          4          4
         4          0          4          4
         0          0          4          4
         0          0          4          4
         0          4          4          4
Execution Plan
Plan hash value: 4115955660
| Id  | Operation           | Name | Rows  | Bytes | Cost (%CPU)| Time     |
|   0 | SELECT STATEMENT    |      |     5 |    40 |     4  (25)| 00:00:01 |
|   1 |  WINDOW BUFFER      |      |     5 |    40 |     4  (25)| 00:00:01 |
|   2 |   SORT GROUP BY     |      |     5 |    40 |     4  (25)| 00:00:01 |
|   3 |    TABLE ACCESS FULL| EMP  |    14 |   112 |     3   (0)| 00:00:01 |
----------------------------------------------------------------------------Personally I think I would have preferred if Oracle raised an error on this "double aggregation" and thus require me to write it this way (if that is the result I desired):
select sum(CLERKS), sum(SALESMANS)
from (select count(decode(job, 'CLERK', 1, null)) CLERKS, count(decode(job, 'SALESMAN', 1, null)) SALESMANS
         from emp group by job)I can not really think of good use-cases for the "double aggregation" - but rather that it could give you unnoticed bugs in your code if you happen to do double aggregation without noticing it.
Interesting thing to know ;-)

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