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WITH TEST(PK,COL1) AS ( SELECT 1, 'A' FROM DUAL UNION ALL SELECT 2, 'B' FROM DUAL UNION ALL SELECT 3, 'B' FROM DUAL UNION ALL SELECT 4, 'B' FROM DUAL UNION ALL SELECT 5, 'A' FROM DUAL UNION ALL SELECT 6, 'B' FROM DUAL UNION ALL SELECT 7, 'B' FROM DUAL UNION ALL SELECT 8, 'B' FROM DUAL UNION ALL SELECT 9, 'B' FROM DUAL ) Select col1, row_number() over (partition by sum_A order by col1) - 1 as result from (Select col1, sum(case when col1 = 'A' Then 1 END) over (order by PK) as sum_A from test)
COL1
RESULT
A
0
B
1
B
2
B
3
A
0
B
1
B
2
B
3
B
4