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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