not so sequential sequences - Mailing list pgsql-general

From Rhys Stewart
Subject not so sequential sequences
Date
Msg-id 189966030610171418v30b3fc23haa726f163ecdd409@mail.gmail.com
Whole thread Raw
Responses Re: not so sequential sequences
Re: not so sequential sequences
List pgsql-general
Hi all, looking for a method to number a table sequentially, but the
sequence only increments if the value in a certain column is
different. as in


seq    |   parish
------------------------
1      | Kingston
1      | Kingston
1      | Kingston
1      | Kingston
2      | Lucea
3      | Morant Bay
3      | Morant Bay
3      | Morant Bay
4      | Port Antonio
5      | Savannah-La-Mar
5      | Savannah-La-Mar
5      | Savannah-La-Mar

so i guess i would order by a certain column and then the 'magic
sequence' would be a column that only increments when the column
changes.

Rhys

pgsql-general by date:

Previous
From: Tom Lane
Date:
Subject: Re: query log corrupted-looking entries
Next
From: Karsten Hilbert
Date:
Subject: Re: exploiting features of pg to obtain polymorphism