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- <li><em>date</em>: Wed, 14 Sep 2005 23:49:57 -0400</li>
- <li><em>from</em>: jkinney at localnetsolutions.com (James P. Kinney III)</li>
- <li><em>in-reply-to</em>: <<a href="msg00308.html">[email protected]</a>></li>
- <li><em>references</em>: <<a href="msg00298.html">[email protected]</a>> <<a href="msg00301.html">[email protected]</a>> <<a href="msg00303.html">[email protected]</a>> <<a href="msg00306.html">[email protected]</a>> <<a href="msg00308.html">[email protected]</a>></li>
- <li><em>subject</em>: [ale] Auto increment in MySQL</li>
I stand corrected. I just tested this and found the following results:
Manually setting AUTO_INCREMENT to a value lower than the highest in
actual use will result in the value being changed by the system as soon
as it is access next.
So I found this by creating a test db with 2 columns, id
(auto_increment) and name. I stated with id=1. I then inserted values
for name and ran the counter in id up to 6. Then I set the
AUTO_INCREMENT value to 3. On the next insert, the AUTO_INCREMENT jumped
up to 8, the new row had a value of 7.
So the system does a MAX on the column and only store the AUTO_INCREMENT
value as a perk.
Now if I changed the value to one higher than currently in use, it kept
it and used it. But when I reset it back to a lower value (in
particular, one that had been skipped) it reset to the MAX+1 value as
earlier.
>
> -G
>
> On 9/14/05, Christopher Fowler <cfowler at outpostsentinel.com> wrote:
> > On Wed, 2005-09-14 at 21:34 -0400, George Carless wrote:
> > > ALTER TABLE theTableInQuestion AUTO_INCREMENT=1234
> > >
> >
> > Here is a question. Lets say that I have a bunch of holes because I
> > deleted various rows. can I set the value to 1 and MySQL will be smart
> > enough to fill those holes?
> _______________________________________________
> Ale mailing list
> Ale at ale.org
> <a rel="nofollow" href="http://www.ale.org/mailman/listinfo/ale">http://www.ale.org/mailman/listinfo/ale</a>
--
James P. Kinney III \Changing the mobile computing world/
CEO & Director of Engineering \ one Linux user /
Local Net Solutions,LLC \ at a time. /
770-493-8244 \.___________________________./
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GPG ID: 829C6CA7 James P. Kinney III (M.S. Physics)
<jkinney at localnetsolutions.com>
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<ul><li><strong>References</strong>:
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<li><strong><a name="00298" href="msg00298.html">[ale] Auto increment in MySQL</a></strong>
<ul><li><em>From:</em> cfowler at outpostsentinel.com (Christopher Fowler)</li></ul></li>
<li><strong><a name="00301" href="msg00301.html">[ale] Auto increment in MySQL</a></strong>
<ul><li><em>From:</em> james.sumners at gmail.com (James Sumners)</li></ul></li>
<li><strong><a name="00303" href="msg00303.html">[ale] Auto increment in MySQL</a></strong>
<ul><li><em>From:</em> kafka at antichri.st (George Carless)</li></ul></li>
<li><strong><a name="00306" href="msg00306.html">[ale] Auto increment in MySQL</a></strong>
<ul><li><em>From:</em> cfowler at outpostsentinel.com (Christopher Fowler)</li></ul></li>
<li><strong><a name="00308" href="msg00308.html">[ale] Auto increment in MySQL</a></strong>
<ul><li><em>From:</em> me at grantrobertson.com (Grant Robertson)</li></ul></li>
</ul></li></ul>
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