Gerald-
In my experience, I have inserted and retrieved from a decent sized db
(a few million records per day), and have gotten
them out in the same order. There were no other operations on the db
except for cronological ones, i.e. delete the
first hundred rows, insert a hundred rows. The results were always
returned in the order expected.
I do not contest that it depends on the dbms as well as any operations
done on existing data.
P
gerald_clark <[EMAIL PROTECTED]>
05/03/2004 02:35 PM
To: Bob Ramsey <[EMAIL PROTECTED]>
cc: [EMAIL PROTECTED]
Subject: Re: urban myth?
It's also not in the order it was entered ( as suggested ).
Bob Ramsey wrote:
> Ah, but the ordering is not random. As your example has it, the
> results are in the order that the entries were inserted into the
> table. There is an explanation for the order of the returned data.
>
> bob
> At 12:55 PM 5/3/2004, Garth Webb wrote:
>
>> On Mon, 2004-05-03 at 10:39, Boyd E. Hemphill wrote:
>> > My boss says that if you do a select statement against a table the
>> > result set always comes back in the same order. I say that this is a
>> > myth and that the result is random, except when some ordering is
>> > specified in the SQL statement.
>> >
>> > Who is right? Is this behavior specified by ANSI or ISO?
>>
>> You are correct. Ordering takes time. Why choose a random column on
>> which to order the results and take additional time when the user
didn't
>> ask for it. Here's the proof:
>>
>> create temporary table foo (num int(10));
>> insert into foo values (1), (2), (3), (4), (5);
>> select * from foo;
>>
>> +------+
>> | num |
>> +------+
>> | 1 |
>> | 2 |
>> | 3 |
>> | 4 |
>> | 5 |
>> +------+
>> 5 rows in set (0.00 sec)
>>
>> delete from foo where num = 3;
>> insert into foo values (6);
>> insert into foo values (3);
>> delete from foo where num = 6;
>> select * from foo;
>> +------+
>> | num |
>> +------+
>> | 1 |
>> | 2 |
>> | 4 |
>> | 5 |
>> | 3 |
>> +------+
>> 5 rows in set (0.00 sec)
>>
>>
>> Garth
>>
>> --
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>
>
>
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