How to count impact / number of occurrence of a string

Hello

If I start with this:

WITH approval_tbl AS
     (SELECT 123456 docno, 'SUBMIT' action_code, '02-MAY-2013 13:09:55' action_date, 0 seq FROM DUAL UNION ALL
      SELECT 123456, 'RESERVE', '02-MAY-2013 13:09:55', 1 FROM DUAL UNION ALL
      SELECT 123456, 'APPROVE', '02-MAY-2013 14:59:47', 2 FROM DUAL UNION ALL
      SELECT 123456, 'APPROVE', '02-MAY-2013 16:25:14', 3 FROM DUAL)
SELECT * FROM approval_tbl WHERE action_code = 'APPROVE';

I wish I could count the number of the impact of each action_code "APPROVE", where the first "APPROVE" impact / occurrence with a SEQ of '2', would have a number of impact of '1', and the following, with a SEQ 3, would be the 2nd impact / occurrence of the string "APPROVE" and therefore would have a number of the impact of the '2 '.

I don't know if my sample data are too basic to be able to generate that info?

Any advice would be much appreciated.

Thank you!

Hello

Do you want results as follows:

A_NUM DOCNO ACTION_ ACTION_DATE SEQ

---------- ---------- ------- -------------------- ----------

1 123456 APPROVE 2 MAY 2013 14:59:47 2

2 123456 APPROVED MAY 2, 2013 16:25:14 3

where the a_num column is generated by the query?

You can use the ROW_NUMBER analytic function for this:

SELECT ROW_NUMBER () OVER (ORDER BY seq) AS a_num

,         a.*

Of approval_tbl one

WHERE action_code = 'APPROVE '.

ORDER BY seq - if desired

;

Tags: Database

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