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create view v ( gebiet ) as ( values ( 'A' ), ( 'A' ), ( 'A' ), ( 'B' ), ( 'B' ), ( 'A' ), ( 'A' ), ( 'B' ) );
with f0 ( id, gebiet ) as ( select row_number() over() id, gebiet from v ), f1 ( id, gebiet, dr ) as ( select id, gebiet, id - dense_rank() over( partition by gebiet order by id) dr from f0 ), f2 ( id, gebiet, mr ) as ( select id, gebiet, min(id) over ( partition by dr order by dr ) from f1 ) select id, gebiet, dense_rank() over ( order by mr ) nummer from f2 order by 1;
id
gebiet
nummer
1
A
1
2
A
1
3
A
1
4
B
2
5
B
2
6
A
3
7
A
3
8
B
4