Peter, Your query may work for data with single-row gaps (like his example data) but it will not work if the sequence skips more than one number.
Look at this sequence: 1,2,3,8,9,10 The OP would like to detect that 4,5,6, and 7 are missing from the sequence. Your query would have only found that 7 was missing. Nice try, but sorry. It just won't meet the need. Shawn Green Database Administrator Unimin Corporation - Spruce Pine Peter Brawley <[EMAIL PROTECTED]> wrote on 08/18/2005 10:56:34 AM: > Scott, > > >How do I execute a query that shows missing ID's like so: > > SELECT id AS i > FROM tbl > WHERE i <> 1 AND NOT EXISTS( > SELECT id FROM tbl WHERE id = i - 1 > ); > > PB > > ----- > > Scott Hamm wrote: > If I got a table as follows: > > > ID foo > 1 12345 > 2 12346 > 4 12348 > 6 12349 > 7 12388 > 9 12390 > How do I execute a query that shows missing ID's like so: > > 3 > 5 > 8 > > I wouldn't expect for it to show deleted data that was deleted, just show > the "skipped" ID's. > > That way I determine if operator deleted too much (cheating at QC) > > Is it possible? > > > > No virus found in this incoming message. > Checked by AVG Anti-Virus. > Version: 7.0.338 / Virus Database: 267.10.12/75 - Release Date: 8/17/2005 > No virus found in this outgoing message. > Checked by AVG Anti-Virus. > Version: 7.0.338 / Virus Database: 267.10.12/75 - Release Date: 8/17/2005 > > > -- > MySQL General Mailing List > For list archives: http://lists.mysql.com/mysql > To unsubscribe: http://lists.mysql.com/[EMAIL PROTECTED]
