Re: PARTIAL, DEFERRABLE UNIQUE CONSTRAINTS

Works like a charm! Thank you very much, PostgreSQL really is an awesome database, and so is the community.

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Von: pgsql-general-owner(at)postgresql(dot)org [mailto:pgsql-general-owner(at)postgresql(dot)org] Im Auftrag von David G Johnston
Gesendet: Mittwoch, 10. September 2014 15:45
An: pgsql-general(at)postgresql(dot)org
Betreff: Re: [GENERAL] PARTIAL, DEFERRABLE UNIQUE CONSTRAINTS

dmigowski wrote
> I need to create a deferrable,unique partial constraint (using a WHERE
> clause) on my table

I don't know the exact required syntax but the description of the "EXCLUDE"
clause to "CREATE TABLE" implies that it can be used to accomplish what you desire.

Not tested but something like:

EXCLUDE USING btree ( col WITH = ) WHERE ... DEFERRABLE INITIALLY IMMEDIATE

http://www.postgresql.org/docs/9.1/static/sql-createtable.html

While the documentation says that using btree with EXCLUDE is uncommon this does seem to be a mandatory exception.

David J.

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