PFC wrote:
> >PostgreSQL does not support MERGE at the moment, sorry.
> 
>       Issue an UPDATE, and watch the rowcount ; if the rowcount is 0, 
>       issue an  INSERT.
>       Be prepared to retry if another transaction has inserted the row  
> meanwhile, though.

Oh, you mean, like the example that's in the documentation?

http://www.postgresql.org/docs/8.1/static/plpgsql-control-structures.html#PLPGSQL-ERROR-TRAPPING

Example 36-1

>       MERGE would be really useful.

It has been discussed before -- MERGE is something different.

-- 
Alvaro Herrera                                http://www.CommandPrompt.com/
PostgreSQL Replication, Consulting, Custom Development, 24x7 support

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