From: | Alban Hertroys <haramrae(at)gmail(dot)com> |
---|---|
To: | emilu(at)encs(dot)concordia(dot)ca |
Cc: | pgsql-sql(at)postgresql(dot)org, "pgsql-general(at)postgresql(dot)org >> \"pgsql-general(at)postgresql(dot)org\"" <pgsql-general(at)postgresql(dot)org> |
Subject: | Re: Simple way to get missing number |
Date: | 2012-04-24 14:41:26 |
Message-ID: | CAF-3MvO+7b6OMGsna1QkajxNzY5XG+XAUuGQgd=qSpAKfP5Ydg@mail.gmail.com |
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Lists: | pgsql-general pgsql-sql |
On 24 April 2012 16:15, Emi Lu <emilu(at)encs(dot)concordia(dot)ca> wrote:
> Good morning,
>
> May I know is there a simple sql command which could return missing numbers
> please?
>
> For example,
>
> t1(id integer)
>
> values= 1, 2, 3 .... 5000000
>
> select miss_num(id)
> from t1 ;
>
>
> Will return:
> ===============
> 37, 800, 8001
>
> Thanks a lot!
> Emi
You can use generate_series() for that, like so:
SELECT num AS missing FROM generate_series(1, 5000000) t(num)
EXCEPT
SELECT id AS missing FROM t1
--
If you can't see the forest for the trees,
Cut the trees and you'll see there is no forest.
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