To: pgsql-sql@postgresql.org
From: Thomas Kellerer <spam_eater@gmx.net>
Subject: Re: PostgreSQL: Inserting NULL values adds empty string.
Date: Sun, 14 Feb 2016 19:21:43 +0100
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Venkatesan, Sekhar schrieb am 14.02.2016 um 14:13:
>
> I am using PostgreSQL 9.4 odbc driver to talk to 9.4 postgreSQL server.
> I see that when inserting NULL values into DB is adding empty  string in the database only in windows.
> The same insert is adding NULL values into database when linux odbc driver is used to connect to linux database.
> Is there any configuration in odbc driver end or in server to retain the null values or is it a bug?
> If it is not and is an expected behavior, how to fix it in the application?
>
> Thanks,
> Sekhar

The server most definitely will not convert a NULL value into an empty string out of the blue.
So it's either the ODBC driver (which I highly doubt) or your application.

Another possible reason is a trigger that converts nulls to empty strings.

Can you show us the insert that is used to store the NULL values?
Are you explicitely listing that column and providing a NULL value?

Or are you maybe not passing a value for that column at all?
In that case the column might be defined as DEFAULT ''


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