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From: Laurenz Albe <[email protected]>
To: me nefcanto <[email protected]>
To: Adrian Klaver <[email protected]>
Cc: [email protected]
Subject: Re: Quesion about querying distributed databases
Date: Wed, 05 Mar 2025 08:39:21 +0100
Message-ID: <[email protected]> (raw)
In-Reply-To: <CAEHBEOD969YrbPH_z9OEmThWx3-w4sMMaHLhZLOQwqCwE8Y58Q@mail.gmail.com>
References: <CAEHBEOBuoMFWuhHM3L_Zr6o1enELju-Vns6Pknt4TT+6MFQOwQ@mail.gmail.com>
	<[email protected]>
	<CAEHBEOD969YrbPH_z9OEmThWx3-w4sMMaHLhZLOQwqCwE8Y58Q@mail.gmail.com>

On Wed, 2025-03-05 at 10:12 +0330, me nefcanto wrote:
> Adrian Klaver, thank you for the link. I asked the AI to create a query for me using FDW.
> 
> The problem here is that it collects all of the product_id values from the ItemCategories table [...]
> 
> That's not scalable. Is there a workaround for this?

Without having scrutinized the case in detail: if your data are organized in an
entity-attribute-value design and distributed across three databases, you cannot
expect to end up with efficient queries.

Perhaps you can extract the data and load them into a reasonably organized
single database.  Such an ETL process might make the task much easier.

Yours,
Laurenz Albe

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