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select based on multi-column primary keys

From: mawrya <mawrya(at)furthernorth(dot)net>
To: pgsql-sql(at)postgresql(dot)org
Subject: select based on multi-column primary keys
Date: 2007-01-20 00:44:50
Message-ID: (view raw or whole thread)
Lists: pgsql-sql
I have set up a table with a multi-column primary key constraint:

  enclosureid numeric(3) NOT NULL,
  pointid char(4) NOT NULL,
  equipmentgroup varchar(64) NOT NULL,
  deviceid varchar(8),
  devicetype varchar(24),
  operationdesc varchar(64) NOT NULL,
  entrytime timestamp NOT NULL DEFAULT ('now'::text)::timestamp(6) with 
time zone,
  systemid numeric(3) NOT NULL,
  CONSTRAINT "ID" PRIMARY KEY (systemid, enclosureid, pointid)

If I had a row in the table where systemid=123, enclosureid=ab, 
pointid=56, I would have a Primary Key ("ID") of 123ab56 for that row.

I now want to run a select based on the Primary Key, something like:

SELECT * FROM iopoints WHERE ID = 123ab56

Is something like this even possible?  Or am I forced to do:

SELECT * FROM iopoints WHERE systemid=123 AND enclosureid=ab AND pointid=56

I have searched high and low but can not find a syntax example of how to 
select based on a multi-column primary key, any tips?




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Subject: Re: select based on multi-column primary keys
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