Hi , 

in oracle 10 g , the below query results in alphabetical order , there is no order by caluse. but when i am running the same query in oracle 11g , it gives me in random order. what is the problem here?

select distinct  Report_137__1_ . COUNTRY_NM   COUNTRY_NM  from (select distinct  v . CTMS_TRIAL_ALIAS_CODE ,  v . CLINICAL_TRIAL_ID ,  c . GEO_BOUNDARY_ID ,  c . COUNTRY_NM ,  c . CANCEL_INDC ,  c . STOP_INDC  from  CTMS_CLINICAL_TRIAL_ID_V   v ,  TRIAL_COUNTRY_V   c  where  v . CLINICAL_TRIAL_ID = c . CLINICAL_TRIAL_ID )  Report_137__1_

 

above is a  simple select statement. Thanks much.

Tags: PL/Sql, by, clause, order

Views: 252

Reply to This

Replies to This Discussion

The problem is simple: The query does not have an ORDER BY clause.

If you want Oracle to guarantee a specific order of a result set *every time you run a query* you have to use an ORDER BY.

But does this means in 10g we do not need to mention order by clause and still we get the result in alphabetical order i.e. ascending order.i understand that we need to mention order by clause to get the result in asc/desc order.

but why here in 10g i am getting the result in asc order without mentioning the order by clause and in 11g m not.

does 10g ,11g have diff in sorting the result set?

 

This means that the query's optimizer plan in 11g is not the same as 10g.

I suggest you read this blog post by Tom Kyte: http://tkyte.blogspot.com/2005/08/order-in-court.html

Thanks a lot , this does help. hope i would be able to make business user understand this ;) 

RSS

Oracle Community On

I'm not a fan of advertising, and so I will not be including any advertisements on OracleCommunity.net. However, managing this community does not come without cost! If you are willing to donate to help pay for the monthly community fees and domain services I accept Bitcoin and PayPal donations.

Donate Bitcoins

Badge

Loading…

Blog Posts

Join cases between related tables in data computing and analytics

Related computing can be: Inner join or outer join. The outer join can be further divided into left join, right join, and full join. With esProc, such kinds ofrelated computing can be easily implemented. In the discussion below, we will introduce the join operations with some examples using the table emp and table sOrder.

Table structure:

The table emp stores the employee data table, in which the…

Continue

Posted by Jim King on August 25, 2014 at 1:35am

Oracle RAC Classes

Contact me for Oracle High Availability Training / Online Classes - Dubai shans.dba@gmail.com

Posted by Shanmugam on August 18, 2014 at 1:00am

Code Examples of In-Memory Grouping for more efficient data computing and analytics

It is convenient to realize some common in-memory grouping with esProc, such as, equal grouping, alignment grouping and enumeration grouping. They are to be illustrated with the following examples.

Equal grouping 

Grouping basis of equal grouping is certain fields (or computed columns derived from fields) within a data set. Each group is a subset of original data set.

Case description: Group sales orders by the year. …

Continue

Posted by Jim King on August 15, 2014 at 12:21am

© 2014   Created by Steve Karam.

Badges  |  Report an Issue  |  Terms of Service