RE: What does LIKE %% actually do in a WHERE clause?

  • From: "Dunbar, Norman (Capgemini)" <norman.dunbar.capgemini@xxxxxxxxxxxxxxxxxxxxxxxxx>
  • To: "info@xxxxxxxxxxxxxxxxxxxxxxxxx" <info@xxxxxxxxxxxxxxxxxxxxxxxxx>, "oracle-l@xxxxxxxxxxxxx" <oracle-l@xxxxxxxxxxxxx>
  • Date: Fri, 7 Oct 2011 06:40:35 +0000

Morning Randolf,

>> I should have added that if you don't use an explicit ORDER 
>> BY clause with top N queries like below your result set 
>> isn't deterministic. 
Yes, that's not a problem in this case - I'm told.

>> ...

>> There are cases where the order really doesn't matter but it 
>> is a common misconception therefore I mention it here.
No worries, I am aware of it though. This is something that  the 
developer/users can run via a front end to the application, so they are doing 
what they want to do.

 
>> ...

>> Using the ROWNUM at the same level as the ORDER BY is again 
>> a common misconception because it will not do what it seems 
>> to express - it will first retrieve the first N random rows 
>> and order them afterwards.
This I know to be true - from past experience! ;-)


>> Hope this helps,
As ever, I'm grateful for all input. Thanks.



Cheers,
Norm.

Norman Dunbar
Contract Senior Oracle DBA
Capgemini Database Build Team
Internal : 7 28 2051
External : 0113 231 2051

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