Group by clase & SQL standard

Hi SQL hackers ...
I know that Oracle add an implicit "order by"
to the "group by" clause ... but I want to
know if it make ir because of SQL stantard, or
just because implementation details(maybe it
internally order before grouping).
By the way, I was looking in the SQL92 draft,
and I couldn't find something related ... so,
is it common implementors choice? ... one can
expect this implicit "order by" in every SQL92
RDBMS?
Thanks in advance
saludos
dario estepario ...
[email protected]

The SQL92 stadard does not require this and Oracle doesn't always do this order.
Oracle queries usually order by the group by, as a side effect of the group by mechanism, but there are exceptions, especially if an index on the group by columns exists with them in a different order or if there are ananytics in the query. If you care about the order, give it explicitly. If Oracle is already sorting by that characteristic, it will not do an extra sort.

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Sorry for the format of the sample data.....!!!!
Thanks, a lot
Simon
Message was edited by:
sgalaxy

To columns... which do have the 'SUM_' prefix ....such as ...
EPONYMO||' '||ONOMA ,
CODE_ERGAZOMENOY_TYPE_ID,
MV_SIGK_KATAST_MINA.ETOS,
PRAGM_ODOIP (nested select query),
DIKAIOUM_ODOIP (nested select query)
I THINK... I HAVE DONE IT... I'LL CHECK IT MORE CAREFULLY...
Thanks...a lot
Simon
Message was edited by:
sgalaxy

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