Ah... I see, that clarifies things. Thank you all for your responses!
All started because I looked a script that is used in our company to backup databases and it seemed odd that the query didn't use an order by sentence which would be helpful, that way I could anticipate when a particular database is going to be backed up, it's easy to fix though so no issues there.
Again thank you all
Best regards
On Apr 19, 2014 10:47 AM, "Tom Lane" <
tgl@sss.pgh.pa.us> wrote:
Elías David <elias.moreno.tec@gmail.com> writes:
> By any change, does the following query have an "order by" by default when
> omitted?:
> select datname from pg_database;
No. No SQL query ever has a "default" order by.
> I executed that query against one of my servers and while looking at the
> names it seems complety random, the order is always the same, for instance:
An unqualified query is typically going to result in a sequential scan
of the table, so what you're seeing is the current physical order of the
tuples. This might change after adding/deleting/changing the properties
of a database.
regards, tom lane