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From: David G. Johnston <[email protected]>
To: yanliang lei <[email protected]>
Cc: [email protected] <[email protected]>
Subject:  Re: in the different schema ，the sequence name is same， and a table's column definition use this sequence,so，how can I identify sequence's schema name by system view/table:
Date: Wed, 1 Oct 2025 07:38:12 -0500
Message-ID: <CAKFQuwbTyugCotCc5dE-5Njy3MG3ZVgDd2c_J9=fU541dnaOWA@mail.gmail.com> (raw)
In-Reply-To: <CAKFQuwaHbepRV5PRb-J-uTgJRSWCsdPXM3SY5KivVPa+y2xM7w@mail.gmail.com>
References: <[email protected]>
	<CAKFQuwaHbepRV5PRb-J-uTgJRSWCsdPXM3SY5KivVPa+y2xM7w@mail.gmail.com>

On Wednesday, October 1, 2025, David G. Johnston <[email protected]>
wrote:

> On Wednesday, October 1, 2025, yanliang lei <[email protected]> wrote:
>>
>> dbversion180=# create table schema_1.test_tab_100(c1 int default
>> nextval('seq_xx_yy'));
>>
>
> Since you didn’t schema qualify the sequence name every single time a
> default value is created the sequence will be looked up anew.  The stored
> expression is not associated with any specific object.
>
> This is also why there is a separate step to mark a sequence as being
> owned by a table.  That establishes a dependency that this textual form is
> unable to do.
>
>
 Ignore that…we do stored the parsed representation which nominally has the
schema recorded, it’s just that the text serialization it too “helpful” by
inspecting the search_path and only produces the schema prefix if it would
be necessary to resolve the reference.

David J.

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