On Sat, Dec 17, 2005 at 03:39:02PM -0800, Bob Pawley wrote:
> The following gives me the information, but the rows are duplicated
> from one to three times. I would like to see one row for each of the
> values. I have attempted a number of variations but they all give me
> similar duplication.
>
> Is this duplication due to the action of postgre as to the information
> I've entered into the tables , or is it due to the structure of the
> command?
Have you tried using parentheses to group the OR expressions in the
WHERE clause?
where (devices.type_ = 'monitor' or devices.type_ = 'valve')
and devices.fluid_id = process.fluid_id;
--
Michael Fuhr
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TIP 9: In versions below 8.0, the planner will ignore your desire to
choose an index scan if your joining column's datatypes do not
match
