On 7/21/19 10:23 AM, Karen Goh wrote:
On Sunday, July 21, 2019, 11:13:58 PM GMT+8, Ron <ronljohnsonjr@xxxxxxxxx>
wrote:
On 7/21/19 10:10 AM, Karen Goh wrote:
[snip]
>
> 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?
I did not do what you think I did.
Perhaps my reasoning is wrong and I really want to have your expert view.
It might sound harsh, but is not meant to be: this list is for administering
PostgreSQL, not teaching basic SQL.
--
Angular momentum makes the world go 'round.
