Sequentially number rows by keyed group in SQL?

Question

Is there a way in SQL to sequentially add a row number by key group?

Assume a table with arbitrary (CODE,NAME) tuples. Example table:

Answer 1

• SQL Server
• Oracle
• Postgres
• Sybase

MySQL doesn't AFAIK. This covers most bases..

SELECT
    CODE,
    ROW_NUMBER() OVER (PARTITION BY CODE ORDER BY NAME) - 1 As C_NO,
    NAME
FROM
    MyTable