Possible new feature percentile?

Hello

I am running "Oracle Database 11 g Enterprise Edition Release 11.2.0.3.0 - 64 bit Production".

I need to calculate percentiles, so I think I have two choices: PERCENTILE_CONT() or PERCENTILE_DISC().
I also need to get the same results as SPSS and SAS tools.
By comparing the results, or versions of Oracle gives the same result as SPSS/SAS. I think it's because of the way Oracle determines which line numbers to use.

Oracle ranks RN = (1 + (classified *(N-1) p), where P is the percentile and N is the number of lines.
For PERCENTILE_CONT (0.1) of a set of 16 lines that would give a row 2.5 as starting point.
http://docs.Oracle.com/CD/B28359_01/server.111/b28286/functions115.htm

SPSS and SAS uses the formula RN = P *(N+1) which gives the rank 1.7 for a set of 16 lines.

Now, it would be possible for me to write a PERCENTILE_SPSS() function?

Examples of analytical/pipelined functions I have seen (and written) are happy to use the lines in the game one by one, to calculate a few special min/max/avg/etc.
For this function, I would need to be
1. to know the number of lines in the game, since the first call of my function and calculate the percentile as my function "passes" the desired lines
or
2 - save all values in the game and calculate the percentile at the end

The first sounds impossible, the second seems expensive for a large table.
Any suggestions?

Kind regards

Tomas

the second seems expensive for a large table

Yes, you are probably right. Write your own aggregate function involves many context switches between SQL and PL/SQL Engine runtime and possibly abuse of PGA memory keeping excessive values in tables and therefore is unlikely to perform as well a solution pure SQL, however desirable encapsulating function may at first seem.

I think using COUNT (*), to get the number of lines and follows the specification for PERCENTILE_CONT http://docs.oracle.com/cd/B19306_01/server.102/b14200/functions110.htm#i1000909 will give you what you need to calculate, for example)

SQL> SELECT DECODE (
  2            MAX (CEIL (prn)),
  3            MAX (FLOOR (prn)), MAX (nr),
  4           (MAX (CEIL (prn)) - MAX (prn)) *
  5              MAX (DECODE (rn, FLOOR (prn), nr)) +
  6           (MAX (prn) - MAX (FLOOR (prn))) *
  7              MAX (DECODE (rn, CEIL (prn), nr))) percentile
  8  FROM   (SELECT ROWNUM rn, COLUMN_VALUE nr,
  9                 0.1 * (COUNT (*) OVER () + 1) prn
 10          FROM   TABLE (sys.odcinumberlist (
 11                    2, 5, 6, 8, 13, 14, 15, 18, 20,
 12                    23, 24, 28, 30, 31, 32, 35)))
 13  WHERE  rn IN (CEIL (prn), FLOOR (prn));

PERCENTILE
----------
       4.1

SQL>

Edit: with hindsight you may prefer the ROWNUM ROW_NUMBER analytic function because it would allow you to order explicitly by nr with unsorted data.

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