Anthony W. Youngman wrote:
>In article <$xpsVWAvnCn$Ew5r@thewolery.demon.co.uk>, Anthony W. Youngman
><thewolery@nospam.demon.co.uk> writes
>
>
>>>Really, however you calculate it, it is an order of magnitude less
>>>than your alternative.
>>>
>>>And please don't tell me that using indexes is not fair or not in the
>>>spirit of the
>>>relational model ;-)
>>>
>>>
>>Well, it does result in data being stored multiple times ;-)
>>
>>And while it maybe doesn't affect the result that much, you wanted the
>>value? Where has that come from? What if the price changed half way
>>through the period you're calculating? :-) You've failed to answer your
>>own question, so maybe I could match you ...
>>
>>
>
>Whoops - sorry - I did notice after I wrote this that you included price
>in your index.
>
OK!
> But it does seem strange indexing on a composite field
>like that ...
>
But why does it seem strange?
regards,
Lauri