Re: constraint with reference to the same table

Victor,

>> You don't need it. Primary key on that 2 columns will create a unique index
>> on them. Of course, if you left things unchanged - you'll need to create
>> business_people index yourself.

Ahh of course ..

"I see said the blind man !" ..

Thanks heaps.
I think now it's pretty clear to me.
I feel I have pretty much optimised my code / sql schema.

Thank you both,
it's a tremendous help - one learns something every day with this list.

Kind regards
Rudi.

Victor Yegorov wrote:

>* Rudi Starcevic <rudi@oasis.net.au> [15.05.2003 05:15]:
>  
>
>>Perhaps I also need a 3rd Index ?
>>
>>One for Business's
>>One for People and
>>One for Business_People.
>>
>>I think I may need the 3rd Index for query's like
>>    
>>
>
>You don't need it. Primary key on that 2 columns will create a unique index
>on them. Of course, if you left things unchanged - you'll need to create
>business_people index yourself.
>
>execute:
>
>=> \d business_people
>
>and take a glance on a line, describing primary key.
>
>  
>