Date: Sun, 21 Jul 2019 15:23:48 +0000 (UTC)
From: Karen Goh <karenworld@yahoo.com>
To: Ron <ronljohnsonjr@gmail.com>
Cc: pgsql-admin@lists.postgresql.org
Message-ID: <927283546.2681887.1563722628862@mail.yahoo.com>
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>
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Subject: Re: How do I alter an existing column and add a foreign key which
 is a Primary key to a table?
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=20


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=E2=80=99t and I don=E2=80=99t 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 =3D tutor_subject.tutor_id
 and tutor_subject.subject_names =3D'Angela Merkel'

Hi Ron,

Could you explain why you select s_tutor.zipcode from tutor_subject since t=
here is no zipcode inside tutor_subject?

Perhaps my reasoning is wrong and I really want to have your expert view.=
=20


--=20
Angular momentum makes the world go 'round.


 =20
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<div>                <br><br><br><br><br>On Sunday, July 21, 2019, 11:13:58=
 PM GMT+8, Ron &lt;ronljohnsonjr@gmail.com&gt; wrote:<br><br><br>On 7/21/19=
 10:10 AM, Karen Goh wrote:<br><br>&gt;<br>&gt; On Sunday, July 21, 2019, 1=
1:06:16 PM GMT+8, David G. Johnston<br>&gt; &lt;david.g.johnston@gmail.com&=
gt; wrote:<br>&gt;<br>&gt;<br>&gt; On Sunday, July 21, 2019, Karen Goh &lt;=
karenworld@yahoo.com&gt; wrote:<br>&gt;<br>&gt;<br>&gt; Is there a way for =
me to generate an entity table diagram vis pgAdmin4 or<br>&gt; PSQL ?<br>&g=
t;<br>&gt;<br>&gt; Just write the 5 or so tables out in a somewhat compress=
ed format. Psql<br>&gt; doesn=E2=80=99t and I don=E2=80=99t know about pgad=
min<br>&gt;<br>&gt; Here is a compressed format :<br>&gt;<br>&gt; s_tutor<b=
r>&gt; --------<br>&gt; zipcode(text)<br>&gt; tutor_id (I just checked this=
 is becomes a &#39;serial id ?&#39; based on the<br>&gt; generated sql<br>&=
gt;<br>&gt; ALTER TABLE public.s_tutor ALTER COLUMN tutor_id ADD GENERATED =
BY DEFAULT<br>&gt; AS IDENTITY (<br>&gt; SEQUENCE NAME public.tutor_strtuto=
rid_seq<br>&gt; START WITH 1<br>&gt; INCREMENT BY 1<br>&gt; NO MINVALUE<br>=
&gt; NO MAXVALUE<br>&gt; CACHE 1<br>&gt; );<br>&gt;<br>&gt; tutor_subject<b=
r>&gt; ----------------<br>&gt; tutor_id<br>&gt; subject_Names<br><br><br>s=
elect s_tutor.zipcode<br>from s_tutor, tutor_subject<br>where s_tutor.tutor=
_id =3D tutor_subject.tutor_id<br>  and tutor_subject.subject_names =3D&#39=
;Angela Merkel&#39;<br><br>Hi Ron,<br><br>Could you explain why you select =
s_tutor.zipcode from tutor_subject since there is no zipcode inside tutor_s=
ubject?<br><br>Perhaps my reasoning is wrong and I really want to have your=
 expert view. <br><br><br>-- <br>Angular momentum makes the world go &#39;r=
ound.<br><br><br><br>            </div>           =20
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