Top N without inline
- From: Dave Pacia <davepacia@xxxxxxxxx>
- To: oracle-l@xxxxxxxxxxxxx
- Date: Wed, 23 Jun 2010 07:57:46 -0700 (PDT)
Hello List,
A friend (report developer) has asked for help, and I have not been able to
give him a satisfactory answer. I'm hoping someone on Oracle-L can help out.
Basically, he wants to run a Top N query that does not use an inline (nested
SQL statement). It's easier in Hyperion 11.3 to select the columns and where
clause, and allow the tool to populate the FROM clause. It isn't an insoluble
problem--we could either build a view or he can paste a SQL statement into
Hyperion, but then any changes to the report spec or table design require that
additional step.
He's using a dense rank function. We can generate Top N queries of the form:
SELECT * FROM
(SELECT pal_attained_mtd, DENSE_RANK () OVER (ORDER BY pal_attained_mtd
DESC) AS RANKINGS, bdm_name
FROM bdm_stats_ts
GROUP BY bdm_name, pal_attained_mtd)
WHERE RANKINGS < 6;
But it would be helpful if we could generate the SQL so that the limitation to
the Top 5 was done in a unnested SQL statement.
Here's the table structure. This is a simplified. The production table has
columns for different kinds of targets and actual results:
BDM_STATS_TS
Name Null?
Type
-----------------------------------------------------------------------
-------- -------------------------------------------------
PAL_ATTAINED_MTD NOT
NULL NUMBER(6,2)
BDM_NAME NOT
NULL VARCHAR2(150)
The database is Oracle 10.2.0 running on Solaris 8.
Thanks in advance,
Dave
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