Numbering of the lines based on two columns

Hello world

I´d would like to know if there is a way to achieve the numbering shown in the second table below indicating only Oracle native functions, like ROW_COUNT() on the partition, etc.

I m using Oracle 10 g.

The logic used is:
From 1, increment one each time that the ORIGIN is identical to the FIRST ORIGIN of the line (ID) group.

ID    ORIGIN    DESTINATION    ORDER
------------------------------------
1     A         B              1
1     B         A              2
1     A         B              3
1     B         C              4
1     C         A              5
 
ID     ORIGIN    DESTINATION    ORDER    NUMBERING
--------------------------------------------------
1      A         B              1        1
1      B         A              2        1
1      A         B              3        2
1      B         C              4        2
1      C         A              5        2

In order to compare the ORIGIN of each line with the FIRST ORIGIN of the group, I used the function LAG to create a column that will be the FIRST ORIGIN of the value in the group.

However, I was not able to number the lines as shown above (column NUMBERING).

Any help will be much appreciated.

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

Test query:

WITH T AS
(
  SELECT 1 ID, 'A' ORIGIN, 'B' DESTINATION, 1 ORDERING FROM DUAL UNION ALL
  SELECT 1 ID, 'B' ORIGIN, 'A' DESTINATION, 2 ORDERING FROM DUAL UNION ALL
  SELECT 1 ID, 'A' ORIGIN, 'B' DESTINATION, 3 ORDERING FROM DUAL UNION ALL
  SELECT 1 ID, 'B' ORIGIN, 'C' DESTINATION, 4 ORDERING FROM DUAL UNION ALL
  SELECT 1 ID, 'C' ORIGIN, 'A' DESTINATION, 5 ORDERING FROM DUAL
)
  SELECT T.ID
       , T.ORIGIN
       , T.DESTINATION
       , T.ORDERING
       , LAG (T.ORIGIN, T.ORDERING -1, 0) OVER (PARTITION BY T.ID
                                                    ORDER BY T.ID
                                                           , T.ORDERING) FIRST_ORIGIN_OF_GROUP
    FROM T
ORDER BY T.ID
       , T.ORDERING

Hello

Here's one way:

WITH     got_first_origin     AS
(
     SELECT     id, origin, destination, ordering
     ,     FIRST_VALUE (origin) OVER ( PARTITION BY  id
                                      ORDER BY         ordering
                                 ) AS first_origin
     FROM    t
)
SELECT     id, origin, destination, ordering
,     COUNT ( CASE
                    WHEN  origin = first_origin
              THEN  1
                END
           )     OVER ( PARTITION BY  id
                       ORDER BY      ordering
               ) AS numbering
FROM     got_first_origin
;

This assumes that the combination of id and order is unique. Within an id, you place your order does not have to be consecutive integers, or something like that.

Analytical functions cannot be nested (the argument of the function of COUNTY anlytic can not call the analytical FIRST_VALUE function); The subquery is necessary.
You could do something with a LAG, as you have tried, rather than FIRST_VALUE, but you would still need a subquery, for the same reason.

Tags: Database

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