Date: Tue, 24 Apr 2012 16:36:55 +0200
From: Andreas Kretschmer <akretschmer@spamfence.net>
To: pgsql-sql@postgresql.org
Subject: Re: Simple way to get missing number
Message-ID: <20120424143655.GA7501@tux>
References: <4F96B57E.8080306@encs.concordia.ca>
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Emi Lu <emilu@encs.concordia.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 ;

something like 

,----[  code  ]
| test=# select * from emi_lu ;
|  i
| ---
|  1
|  2
|  3
|  5
|  6
|  8
|  9
| (7 rows)
|
| Time: 0,246 ms
| test=*# select * from generate_Series(1,10) s left join emi_lu on
| (s=emi_lu.i) where i is null;
|  s  | i
| ----+---
|   4 |
|   7 |
|  10 |
| (3 rows)
`----

this?


Andreas
-- 
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