Re: sort order on VIEWs ?

You might want to read this ask tom page:
http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:3229251700346962181

"You can create a view with an order by - any select against the view would
return the data sorted..

HOWEVER, a query that joins that view or references another table in fact,
might not be 'sorted' anymore.

So, you can create a view, applications would use the view not the table -
but you would have to bear in mind that if they use more than just the view
- the results might not be sorted, they might be sorted - it depends on the
plan we decide to use."

Harel Safra

On Wed, Apr 20, 2011 at 9:45 PM, Michael Moore <michaeljmoore@xxxxxxxxx>wrote:

> I am really trying to make a case to somebody else that he should* not* do
> it. However, there is the matter of convenience.
>
> Select * from my_view order by
> cust_num,billing_cycle_period,invoice_id,line_id,unit_price;
>
> Now if I have to type that out a dozen times a day, and that is always the
> sort order (i.e. nothing else really makes any sense) then it might
> be convenient to have the sort order on the view.
>
> That's the only counter argument I could come up with.
>
> Regards,
>
> Mike
>
>
> On Wed, Apr 20, 2011 at 11:39 AM, Lange, Kevin G 
> <kevin.lange@xxxxxxxxxx>wrote:
>
>>  Yea, I was gonna ask you the question ........ why would you include an
>> order by in a view ?
>>
>>  ------------------------------
>> *From:* Michael Moore [mailto:michaeljmoore@xxxxxxxxx]
>> *Sent:* Wednesday, April 20, 2011 1:38 PM
>> *To:* Lange, Kevin G
>> *Cc:* oracle-l@xxxxxxxxxxxxx
>> *Subject:* Re: sort order on VIEWs ?
>>
>> Thanks kevin.
>> Since asking the question I did some digging.
>>
>> http://en.wikipedia.org/wiki/View_(database)
>> 4th paragraph
>>
>> The take-away is that you can do it in Oracle, but it's not standard and
>> probably not a good idea.
>>
>> Regards,
>> Mike
>>
>>
>> On Wed, Apr 20, 2011 at 11:34 AM, Lange, Kevin G 
>> <kevin.lange@xxxxxxxxxx>wrote:
>>
>>>  Not sure about a Guarantee, but, in my tests, as long as I did not
>>> include an order by on the query contrary to the order by on the view, I got
>>> my data in the order of the views order by.
>>>
>>> Of course, it was a small sampling of data.
>>>
>>>  ------------------------------
>>> *From:* oracle-l-bounce@xxxxxxxxxxxxx [mailto:
>>> oracle-l-bounce@xxxxxxxxxxxxx] *On Behalf Of *Michael Moore
>>> *Sent:* Wednesday, April 20, 2011 1:20 PM
>>> *To:* oracle-l@xxxxxxxxxxxxx
>>> *Subject:* sort order on VIEWs ?
>>>
>>>  If a VIEW has an ORDER BY clause, am I guaranteed to get that sort
>>> order when I use the VIEW (provided of course that I don't specify a
>>> different sort order)?
>>>
>>> Regards,
>>> Mike
>>>
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>>
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>
>

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