sql - How do I force the rank function to assign a different value to rows of equal rank? -


i have table in data base similar one

id    year    quarter    ..... 1     2000    3 2     2002    4      1     2003    3 1     2000    3

the key data base combination of id, year, , quarter. need grab recent entry each id, used rank function one:

select id ( select id, year, quarter rank() on (partition id order year + quarter) rank mytable ) tmp rank = 1

it possible there entry in data base has same id, year, , quarter. need able choose 1 of them none of others. don't particularly care one, not more one. have been reading through msdn pages , can't seem find looking for. have ideas? thank you.

there 3 basic options - in case, others noted, should use row_number().

value  row_number  rank  dense_rank      1           1     1      2           1     1 b      3           3     2 d      4           4     3 e      5           5     4

basically, row_number assigns rows 1 number, , not duplicate or skip values (unless using partition). rank allows ties, , skips values if there tie previous value. dense_rank allows ties, , not skip values.


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