From: Andreas Kretschmer <akretschmer@spamfence.net>
To: pgsql-sql@postgresql.org
Subject: Re: Simple way to get missing number
Date: Tue, 24 Apr 2012 16:36:55 +0200
Message-ID: <20120424143655.GA7501@tux> (raw)
In-Reply-To: <4F96B57E.8080306@encs.concordia.ca>
References: <4F96B57E.8080306@encs.concordia.ca>
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
--
Really, I'm not out to destroy Microsoft. That will just be a completely
unintentional side effect. (Linus Torvalds)
"If I was god, I would recompile penguin with --enable-fly." (unknown)
Kaufbach, Saxony, Germany, Europe. N 51.05082°, E 13.56889°
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To: pgsql-sql@postgresql.org
Cc: akretschmer@spamfence.net
Subject: Re: Simple way to get missing number
In-Reply-To: <20120424143655.GA7501@tux>
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