From: | Rob Sargent <robjsargent(at)gmail(dot)com> |
---|---|
To: | Ian Tan <iantan1268(at)gmail(dot)com> |
Cc: | Andrew Gierth <andrew(at)tao11(dot)riddles(dot)org(dot)uk>, pgsql-sql(at)lists(dot)postgresql(dot)org |
Subject: | Re: Help on SQL query |
Date: | 2019-02-15 19:03:00 |
Message-ID: | 951259bf-280d-ce6d-7493-cdbb628074f0@gmail.com |
Views: | Raw Message | Whole Thread | Download mbox | Resend email |
Thread: | |
Lists: | pgsql-sql |
On 2/15/19 11:16 AM, Ian Tan wrote:
> Hello Andrew,
> Thank you, I appreciate your response and your help.
>
> Hello Rob,
> I learn in my own time and had no one to ask. If pgsql-sql is not the
> correct forum for these kinds of question, kindly let me know.
>
> Thank you.
>
> Regards,
> Ian
>
> On Fri, 15 Feb 2019 at 17:38, Rob Sargent <robjsargent(at)gmail(dot)com> wrote:
>>
>>
>>> On Feb 15, 2019, at 10:28 AM, Andrew Gierth <andrew(at)tao11(dot)riddles(dot)org(dot)uk> wrote:
>>>
>>>>>>>> "Ian" == Ian Tan <iantan1268(at)gmail(dot)com> writes:
>>> Ian> How do I write an SQL query so that the "name" text in car_parts
>>> Ian> are added to the bill_of_materials table, so that it looks like
>>> Ian> this:
>>>
>>> The only trick with this is that you need to join the car_parts table
>>> twice (once for parent and once for child), and to do that you need to
>>> give it different alias names:
>>>
>>> select bom.parent_id,
>>> ppart.name as parent_name,
>>> bom.child_id,
>>> cpart.name as child_name
>>> from bill_of_materials bom
>>> join car_parts ppart on (ppart.id=bom.parent_id)
>>> join car_parts cpart on (cpart.id=bom.child_id);
>>>
>>> --
>>> Andrew (irc:RhodiumToad)
>>>
>> Andrew, will you do my homework too?
My apologies. It looked suspiciously like a homework question to me.
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