new table row numbering

Hello

I have a table with 4 columns

Seq_current_row seq_next_row A B

123456 123457 2 2

123457 123458 3 3

123458 123459 2 2

123459 123460 2 2

123460 123461 4 7

123461 123462 2 2

123462 123463 1 2

I would like to get a table with an additional column (C), which contains

a sequence number incremented only if the value of the column is different from B

A             B             C

2             2             1

3             3             1

2             2             1

2             2             1

4             7             2             (A=! (B) = > valore della riga previous + 1 C

2             2             2

1             2             3             (A=! (B) = > valore della riga previous + 1 C

RDBMS-> Oracle 11.2.2

OS-> Linux

Thanks in advance

lukx

How about this

WITH xxx AS
        (SELECT 123456 Seq_current_row, 2 A, 2 B FROM DUAL
         UNION ALL
         SELECT 123457, 3, 3 FROM DUAL
         UNION ALL
         SELECT 123458, 2, 2 FROM DUAL
         UNION ALL
         SELECT 123459, 2, 2 FROM DUAL
         UNION ALL
         SELECT 123460, 4, 7 FROM DUAL
         UNION ALL
         SELECT 123461, 2, 2 FROM DUAL
         UNION ALL
         SELECT 123462, 1, 2 FROM DUAL)
SELECT   A,
         B,
         (SUM(CASE WHEN A != B THEN 1 ELSE 0 END) OVER (ORDER BY Seq_current_row)) +1 C
FROM     xxx
ORDER BY Seq_current_row

Tags: Database

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