From: Richard Huxton <dev@archonet.com>
To: Ajit Aranha <ajit_aranha@rocketmail.com>
To: pgsql-sql@postgresql.org
Subject: Re: Null not equal to '' (empty)
Date: Fri, 27 Sep 2002 13:36:03 +0100
Message-ID: <200209271336.03193.dev@archonet.com> (raw)
In-Reply-To: <20020920060916.42881.qmail@web14104.mail.yahoo.com>
References: <20020920060916.42881.qmail@web14104.mail.yahoo.com>
On Friday 20 Sep 2002 7:09 am, Ajit Aranha wrote:
> Why is ''(empty) not equal to null? Its a major headache when porting
> from other RDBMS like Oracle. Anyone knows any easy workarounds?
By definition it is different - null means "not known" or "no value" not empty
string. Do you think it should be zero for numbers?
> i.e. if you use: create table tbl (
> c1 varchar(5));
> insert into tbl values ('');
> select * from tbl where c1 is null; will return
> zero rows.
Yep - that's the way it should be. If you want empty-strings, ask for them. If
you don't want to allow null values in a column define it as NOT NULL.
- Richard Huxton
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To: pgsql-sql@postgresql.org
Cc: dev@archonet.com, ajit_aranha@rocketmail.com
Subject: Re: Null not equal to '' (empty)
In-Reply-To: <200209271336.03193.dev@archonet.com>
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