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From:Gerald Clark Date:June 27 2002 8:26pm
Subject:Re: MySQL Question involving AUTO INCREMENT and PRIMARY IDs. - sql
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That is a difference in the behavior of
isam and myisam tables.

jason wesley upton wrote:

>EXPLANATION:
>
>here's the pertinent piece of my sql create statement:
>
>ID INT NOT NULL  AUTO_INCREMENT, PRIMARY KEY (ID));
>
>i have used this create statement numerous times without this "problem".  in the past,
> let's say i inserted 3 entries: A, B, and C.  their IDs were 1,2, and 
>3.  then i delete C from the database.  when i then insert D its ID is 4.  leaving
> 1,2, and 4 in the database.  seems like this is safe and as it should be.
>
>all this morning, using the above example with a deviation...after i delete C and then
> insert D...D's ID is 3. if i delete B and C, then insert D and E...their 
>ID's are 2 and 3.  
>
>i was under the impression that once an ID had been used (in auto increment and as
> primary) it was gone.  must i also make the ID "unique"? i can see 
>why a primary key might need to be not UNIQUE (for concatenation of entries...etc),
> but i don't think i've done it iN the past (when it has incremented 
>correctly).   
>
>
>
>thanks ahead of time.  query sql for the filter.
>
>
>
>jason wesley upton
>
>
>
>
>
>
>
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Thread
MySQL Question involving AUTO INCREMENT and PRIMARY IDs. - sqljason wesley upton27 Jun
  • Re: MySQL Question involving AUTO INCREMENT and PRIMARY IDs. - sqlGerald Clark27 Jun
  • Re: MySQL Question involving AUTO INCREMENT and PRIMARY IDs. - sqlWilliam R. Mussatto27 Jun