Re: Basic Query Question

could you post the query you tried?

On 12/7/11 4:20 PM, Jude Lucien wrote:
> That query doesn't work for me as I can't make seem to add "WHERE
> model='model'" to the query if I use a JOIN.
>
>
> On 7 December 2011 21:16, Ramy Abdel-Azim
> <ramy(dot)abdel-azim(at)startdatelabs(dot)com> wrote:
>> try it out and let us know.
>> we anxiously await your reply ;-)
>>
>>
>> On 12/7/11 4:15 PM, Jude Lucien wrote:
>>> I've just realised why it may not be working - bike_id is not the
>>> primary key of booking. booking_id is.
>>>
>>> I was getting results, just not the correct ones. There are 23 bikes
>>> of a certain model, two of which are booked on a certain date. My
>>> query should then return 21 bike_id's.
>>>
>>> Can I even do a join if booking.bike_id is not the primary key?
>>>
>>>
>>> On 7 December 2011 21:02, Ramy Abdel-Azim
>>> <ramy(dot)abdel-azim(at)startdatelabs(dot)com> wrote:
>>>> i'm not sure but i think not being explicit about the join causes psql to
>>>> try to join on ID.
>>>>
>>>> What are you getting? an error or an empty result set?
>>>>
>>>> I would think you should do the join explicitly like this:
>>>>
>>>> select bike.bike_id from bike join booking on bike.bike_id =
>>>> booking.bike_id where booking.date != '2011-11-20'
>>>>
>>>>
>>>> On 12/7/11 3:55 PM, Jude Lucien wrote:
>>>>> Sorry for the basic question, I can't seem to figure it out.
>>>>>
>>>>> I have two tables, booking and bike. Both have bike_id as primary key.
>>>>>
>>>>> I am trying to return all bike_id's where bike.model='Kona' AND
>>>>> booking.booking_date DOES NOT EQUAL 'date';
>>>>>
>>>>> My query is as follows:
>>>>>
>>>>> SELECT bike.bike_id FROM bike,booking WHERE bike.model='model' AND
>>>>> booking.booking_date!='2011-11-20' AND bike.bike_id=booking.bike_id;
>>>>>
>>>>> Any help appreciated!
>>>>>
>>>>> Jude
>>>>>
>>>>>
>>>>>
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>>>
>>>
>
>