untested, but you are looking for something like this (formatted for humans):
select
concat(
ifnull(
if(l.client_id,'L',null),
ifnull(
if(p.prospect_id,'P',null),
'C')),
c.contact_id) as reference_number,
from contact c
left join prospect p on c.contact_id = p.prospect_id
left join client l on p.prospect_id = l.client_id
- md
ifnull( if(l.client_id,'L',null),
ifnull(if(p.prospect_id,'P',null),'C'))
On Tue, Nov 24, 2009 at 8:43 PM, Neil Aggarwal <n...@jammconsulting.com> wrote:
>> concat('C',c.contact_id) as ref
>
> That worked. Thanks the the tip.
>
> Now, lets say I have three tables:
>
> contact
> contact_id int
>
> prospect
> prospect_id int
>
> client
> client_id int
>
>
> If a contact is a prospect, it will have a line in
> both the contact and prospect table, with the same
> id value.
>
> If a contact is a client, it will have a line in
> the contact, prospect, and client table, all with
> the same id value.
>
> For example:
>
> contact_id 1
>
> contact_id 2
> prospect_id 2
>
> contact_id 3
> prospect_id 3
> client_id 3
>
> I want the ref numbers to be:
> C1
> P2
> L3
>
> Is there a way to use a query to do that?
>
> Something like:
>
> create or replace view
> view_AllData as
> select
> concat('C' or 'P' or 'L',c.contact_id) as reference_number,
> from contact c
> left join prospect p on c.contact_id = p.prospect_id
> left join client l on p.prospect_id = l.client_id
>
> Any ideas how to do this?
>
> Thanks
> Neil
>
> --
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- mdyk...@gmail.com
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