oracle - Ranking without an order by -


is there way create row_number "on fly" without ordering column? i've got query :

select regexp_substr(',a-b,b-c,c-d', '[^,]+', 1, level) legs           dual         connect regexp_substr(',a-b,b-c,c-d', '[^,]+', 1, level) not null

and need keep order of rotation, need rank sure rotation good. tried take near rank, dense_rank, row_number,... need order by, can't use.

it give this

rank   |   legs    1     |   a-b  2     |   b-c  3     |   c-d

you can use level, though need alias it:

select level rnk,   regexp_substr(',a-b,b-c,c-d', '[^,]+', 1, level) legs dual connect regexp_substr(',a-b,b-c,c-d', '[^,]+', 1, level) not null;         rnk legs        ---------- ------------          1 a-b                   2 b-c                   3 c-d

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