MySQL - generate numbers for groups of a result

Posted by FreeIX on Stack Overflow See other posts from Stack Overflow or by FreeIX
Published on 2010-06-08T22:28:37Z Indexed on 2010/06/10 17:42 UTC
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I need a query to return this result:

+---------+-----+-------+
| ref_nid | nid | delta |
+---------+-----+-------+
|   AA    | 97  |  1    |
|   BB    | 97  |  2    |
|   CC    | 97  |  3    |
|   DD    | 98  |  1    |
|   EE    | 98  |  2    |
|   FF    | 98  |  3    |
+---------+-----+-------+

However, I do not have the delta column. I need to generate it for each nid group.

In other words, I need an auto incremented number for each group of the result.

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