highest average maxtemp in a sql statement
Hi have a table like this-WANT-
CREATE TABLE INSERT_TABLE
(
STATE VARCHAR2 (50 BYTE),
CITY VARCHAR2 (50 BYTE),
MINTEMP INTEGER,
MAXTEMP INTEGER
)
CITY STATE MINTEMP MAXTEMP
NEW JERSEY JERSEY CITY 40 80
NEWARK NJ 60 90
NEW YORK NEW YORK 40 78
NY 20 65 BUFFALLO
I want to get the State with the highest average maxtemp in a sql statement.
CGH
In this case, the result should be--
AVGTEMP STATE
NJ 85
I can do using subqueries, but I was wondering if there is a way I can achieve using analytical functions?
Published by: girija_pathak on April 28, 2010 10:05
Hello
girija_pathak wrote:
Hi Frank,.
I'm sorry that I have not tried the two of you suggestions
The first request was just to show what is in the table scott.emp. It has nothing to do with your problem; It lights up only on the second query and its results.
the second qry viz.
SELECT MIN (State) DUNGEON (DENSE_RANK LAST ORDER BY AVG (MAXTEMP)) AS deptno_of_max
MAX (AVG (MAXTEMP)) AS max_avg_sal
OF the test
State of GROUP BY
;result-
DEPTNO_OF_MAX | MAX_AVG_SAL
NJ | 85is perfect.
Can you explain a bit how it works?
When you use a nested aggregate functions (such as MAX (AVG (maxtemp))) the internal functions are evaluated first, by using the GROUP BY clause (and SEEN, when it exists); then the external functions are evaluated, composed a GROUP BY clause. In other words, the nested aggregate query I posted Gets the same results as:
WITH inner_aggregates as
(
SELECT deptno
, AVG (sal) AS avg_sal
FROM scott.emp
GROUP BY deptno
)
SELECT MIN (deptno) KEEP (DENSE_RANK LAST ORDER BY avg_sal) AS deptno_of_max
, MAX (avg_sal) AS max_avg_sal
FROM inner_aggregates
;
The LAST function is described in the manual of the SQL language:
http://download.Oracle.com/docs/CD/B28359_01/server.111/b28286/functions076.htm#sthref1540
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where
RUNTIME_MEM > 0;
NUM_SQL_TOTAL NUM_ONE_USE_SQL NUM_NO_USE_SQL MB_USED MB_FOR_ONE_USE_SQL MB_FOR_NO_USE_SQL 23318
8739
8027
1420,95619106293
381,41183757782
530,999855041504
Concerning
Thomas
This is not unusual. Another app could analyze for example hard the most often used SQLs in upstairs app - making benefit of further processing (in theory) of sweet analysis when you use these SQLs.
In fact, I remember reading something to this effect as a performance for some factor or another Oracle document or note?
So unless you have serious questions of shared pool, why bother with these sliders? What would be the problem?
-
Order of execution of SQL statements
Hello
I have two SQL statements where the first statement executes on a table with more than 40 million lines, the second statement is running on a table more 6 million lines. When they are running their own each take about 0.15 seconds to run, but when combined they take 20 minutes to run, (the second SQL statement is inserted in the WHERE clause of the statement of first). It would seem that after combining these statements, the first statement goes through all 40 million lines before it performs the SELECT in the WHERE clause. I think that what is necessary is to ensure the SELECT in the WHERE clause is executed first... or something like that! Anyone has any ideas on how to combine these statements but not suffer from the performance impact?
The first statement is:
Select csi.instance_id,
OEL.ordered_item
of apps.csi_item_instances csi,.
Apps.oe_order_lines_all oel
where csi.instance_id in
(1718000,3698000,48740202)
and csi.last_oe_order_line_id = oel.line_id;
The second statement is:
Select / * + INDEX (IEA (attribute_id)) * /.
IEA.instance_id
apps.csi_iea_values do
where iea.attribute_id = 10004
and iea.attribute_value is not null;
The joint return is:
Select csi.instance_id,
OEL.ordered_item
of apps.csi_item_instances csi,.
Apps.oe_order_lines_all oel
where csi.instance_id in
(select / * + INDEX (IEA (attribute_id)) * /)
IEA.instance_id
apps.csi_iea_values do
where iea.attribute_id = 10004
and iea.attribute_value is not null)
and csi.last_oe_order_line_id = oel.line_id;
Thanks for any help,
Mike
Your subquery returns probably just two values that you did originally as constants - but the optimizer thinks that you're going to get 564 K lines. This is why the indicator for the simple query has a beneficial effect, it forces the Oracle to use an index when it would otherwise make a search.
When the subquery is incorporated, however, the optimizer uses its cardinality expected to decide whether to use a nested loop join or the hash join to CSI_ITEM_INSTANCES, since the large enough estimate, he uses the hash with a join analysis complete. That's why I pointed out that the fact to tell the optimizer to how many lines outside the subquery should make a difference.
Have you tried the "common table expression" approach, rather than approach no_merge, but it would not help because it does not change the optimizer for cardinality estimate. If you want to repeat the method CTE adding boards / * + materialize cardinality (2) * / to the query in the WITH clause, you should get the desired result.
Concerning
Jonathan Lewis
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