sequence numbers

Hello

I need to generate sequence numbers for each order based on the time of the edict
table:order_edits

has 2 columns
id number (10)
edit_time (date)
date of the sample

ID EDIT TIME
9009-1/31 / 2010 13:10
9009-1/31 / 2010 14:10

9002 1/27 / 2010 09:00

9007 1/15 / 2010 11:15
9007 1/17 / 2010 09:00
i am looking for sequence numbers for each orderid based on edit time
Order_edit of TIME CHANGE ID
9009-1/31 / 2010 13:10 1
9009-1/31 / 2010 14:10 2

9002 1/27 / 2010 09:00 1

9007 1/15 / 2010 11:15 1
9007 1/17 / 2010 09:00 2


any help is appreciated                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        

Hello

The ROW_NUMBER analytic function has been designed for this:

SELECT       id, edit_time
,       ROW_NUMBER () OVER ( PARTITION BY  id
                            ORDER BY          edit_time
                    )    AS order_edit
FROM      order_edits
ORDER BY  id, edit_time          -- Optional
;

If (id, edit_time) is not unique, each row will always get a separate number.

The ORDER BY clause from the query (if it exists) is independent of the ORDER byclause Analytics . The two may be identical, they may be similar (see above), or they may have nothing at all in common.

Tags: Database

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