Re: Simple way to get missing number

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

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