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help / color / mirror / Atom feedFrom: Karen Goh <karenworld@yahoo.com>
To: Ron <ronljohnsonjr@gmail.com>
Cc: pgsql-admin@lists.postgresql.org
Subject: Re: How do I alter an existing column and add a foreign key which is a Primary key to a table?
Date: Sun, 21 Jul 2019 15:23:48 +0000 (UTC)
Message-ID: <927283546.2681887.1563722628862@mail.yahoo.com> (raw)
In-Reply-To: <75125c45-0fed-e5f1-50f0-9646db20dde6@gmail.com>
References: <820008379.2579287.1563670685484@mail.yahoo.com>
<5CE41E80-274A-44DA-9553-E2DCA260F751@jakobs.com>
<385857992.2643116.1563717238725@mail.yahoo.com>
<923fb3b1-90e9-e0b5-bc5b-d896128c3f28@gmail.com>
<1745586001.2633224.1563719075867@mail.yahoo.com>
<CAKFQuwYwO4EdGQ_H6avBUQaeUTOyoLFw17OicCXsFzVVri4aUw@mail.gmail.com>
<905425626.2686338.1563721213121@mail.yahoo.com>
<CAKFQuwahWO9HrmcNjkfkaj0cAbFJB6mTVEOUGQZiy9EojTJQOw@mail.gmail.com>
<2030754658.2646264.1563721831668@mail.yahoo.com>
<75125c45-0fed-e5f1-50f0-9646db20dde6@gmail.com>
On Sunday, July 21, 2019, 11:13:58 PM GMT+8, Ron <ronljohnsonjr@gmail.com> wrote:
On 7/21/19 10:10 AM, Karen Goh wrote:
>
> On Sunday, July 21, 2019, 11:06:16 PM GMT+8, David G. Johnston
> <david.g.johnston@gmail.com> wrote:
>
>
> On Sunday, July 21, 2019, Karen Goh <karenworld@yahoo.com> wrote:
>
>
> Is there a way for me to generate an entity table diagram vis pgAdmin4 or
> PSQL ?
>
>
> Just write the 5 or so tables out in a somewhat compressed format. Psql
> doesn’t and I don’t know about pgadmin
>
> Here is a compressed format :
>
> s_tutor
> --------
> zipcode(text)
> tutor_id (I just checked this is becomes a 'serial id ?' based on the
> generated sql
>
> ALTER TABLE public.s_tutor ALTER COLUMN tutor_id ADD GENERATED BY DEFAULT
> AS IDENTITY (
> SEQUENCE NAME public.tutor_strtutorid_seq
> START WITH 1
> INCREMENT BY 1
> NO MINVALUE
> NO MAXVALUE
> CACHE 1
> );
>
> tutor_subject
> ----------------
> tutor_id
> subject_Names
select s_tutor.zipcode
from s_tutor, tutor_subject
where s_tutor.tutor_id = tutor_subject.tutor_id
and tutor_subject.subject_names ='Angela Merkel'
Hi Ron,
Could you explain why you select s_tutor.zipcode from tutor_subject since there is no zipcode inside tutor_subject?
Perhaps my reasoning is wrong and I really want to have your expert view.
--
Angular momentum makes the world go 'round.
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To: pgsql-sql@postgresql.org
Cc: karenworld@yahoo.com, ronljohnsonjr@gmail.com, pgsql-admin@lists.postgresql.org
Subject: Re: How do I alter an existing column and add a foreign key which is a Primary key to a table?
In-Reply-To: <927283546.2681887.1563722628862@mail.yahoo.com>
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