Re: How to find Missing Sequences

How about something like:
given a table:
tbl {
pk int4
}
SELECT ((SELECT max(pk) as lub FROM tbl AS t WHERE t.pk<tbl.pk).lub+1)::text
|| ' to ' || tbl(tbl.pk-1)::text FROM tbl WHERE NOT EXISTS (SELECT pk FROM
tbl AS tb WHERE tb.pk=tbl.pk-1)
hth,
- Stuart
P.S. Sorry about the format change the disclaimer adder forces :(

> -----Original Message-----
> From: Madhavi Daroor [mailto:madhavi(at)zoniac(dot)com]
> Sent: 15 July 2003 09:45
> To: pgsql-general(at)postgresql(dot)org
> Subject: [GENERAL] How to find Missing Sequences
>
>
> I have a problem here.....I need to get a list of sequence ids of a
> particular sequence. What I mean by this is....I have a table that has
> say...15 records....and I'm using a sequence for the primary
> key of that
> table. Now the values of the primary key is 1 to 10 for the
> 1st 10 records.
> And then since the sequence has beed skipped or some other
> problem...the
> 11th record begins with 16 as the value for the primary key.
> So the next 5
> records have primarykeys with values 16 to 20 instead of 11 to 15.
>
> Now I want an sql statement that can fetch me a list of all
> these skipped
> sequence id...ie, from 11 to 15. How do I do that? Or Is
> there any other way
> (other than looping through the numbers)to find these values?
>
> Thanx
> Madhavi
>
>
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