List:General Discussion« Previous MessageNext Message »
From:Mike Diehl Date:September 18 2008 5:16pm
Subject:Re: Finding gaps
View as plain text  
Hi all,

I'm just throwing something out ...

How about:

select a.id,b.id from dataset a left join dataset b 
	on a.id=b.id+1 
	where b.id is null; 

This should find single gaps.  It won't find larger gaps.

Just my $.02.

Mike.

On Thursday 18 September 2008 10:44:47 am Jerry Schwartz wrote:
> >-----Original Message-----
> >From: Stut [mailto:stuttle@stripped]
> >Sent: Wednesday, September 17, 2008 6:30 PM
> >To: Jerry Schwartz
> >Cc: mysql@stripped
> >Subject: Re: Finding gaps
> >
> >On 17 Sep 2008, at 22:34, Jerry Schwartz wrote:
> >> Our Japanese partners will notice and will ask. Similar things have
> >> come up
> >> before.
> >>
> >> I want to be pro-active.
> >
> >Notice what? Why would it be bad? What type of data are we dealing
> >with here?
>
> [JS] In this case, we are dealing with a list of products.
>
> >If each row requires a unique ID use an autonumber. If your partners
> >don't understand that deleted items will create gaps, explain it to
> >them. IMHO you're creating a problem that doesn't exist.
>
> [JS] I can pass along my boss's email address, if you want to explain to
> him why it doesn't matter. Personally, I depend upon my job.
>
> >If you just need sequential numbers for display purposes, generate
> >them when you do the displaying. There's no need for those numbers to
> >be in the database.
>
> [JS] They are propagated into other databases that I do not control. They
> are managed and used by our main office in Japan. They notice everything
> (except misspellings).



-- 
Mike Diehl
Thread
Finding gapsJerry Schwartz17 Sep
  • Re: Finding gapsStut17 Sep
    • Re: Finding gapsPeter Brawley17 Sep
      • RE: Finding gapsJerry Schwartz8 Oct
        • Re: Finding gapsGerald L. Clark8 Oct
          • RE: Finding gapsUS Data Export8 Oct
        • Re: Finding gapsPeter Brawley8 Oct
          • RE: Finding gapsUS Data Export9 Oct
            • Re: Finding gapsPeter Brawley9 Oct
              • RE: Finding gapsJerry Schwartz10 Oct
                • Re: Finding gapsMoon's Father25 Oct
                  • Re: Finding gapsMoon's Father25 Oct
                  • RE: Finding gapsUS Data Export27 Oct
    • RE: Finding gapsJerry Schwartz17 Sep
      • Re: Finding gapsStut18 Sep
        • Re: Finding gapsMr. Shawn H. Corey18 Sep
        • RE: Finding gapsJerry Schwartz18 Sep
          • Re: Finding gapsMike Diehl18 Sep
            • RE: Finding gapsJerry Schwartz18 Sep
    • RE: Finding gapsMartin Gainty18 Sep
      • RE: Finding gapsJerry Schwartz18 Sep
    • Re: Finding gapsJoerg Bruehe18 Sep
    • Re: Finding gapsJoerg Bruehe18 Sep
      • Re: Finding gapsStut18 Sep
        • Re: Finding gapsMr. Shawn H. Corey18 Sep