Sign Up to our social questions and Answers Engine to ask questions, answer people’s questions, and connect with other people.
Login to our social questions & Answers Engine to ask questions answer people’s questions & connect with other people.
Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Please briefly explain why you feel this question should be reported.
Please briefly explain why you feel this answer should be reported.
Please briefly explain why you feel this user should be reported.
May order of rows in unordered query (like select * from smth) be different in different queries (in the same and not same session) if there are no updates to database table?
The order or rows returned from a query should never be relied upon unless you have included a specific
ORDER BYclause in your query.You may find that even without the
ORDER BYthe results appear in the same order but you could not guarentee this will be the case and to rely on it would be foolish especially when theORDER BYclause will fulfill your requirements.See this question: Default row ordering for select query in oracle
It has an excellent quote from Tom Kyte about record ordering.
So to answer your question: Yes, the order of rows in an unordered query may be different between queries and sessions as it relies on multiple factors of which you may have no control (if you are not a DBA etc.)
Hope this helps…