Re: [SQL] NOT NULL and postgres 6.5.2 - Mailing list pgsql-sql

Stephan Bauer <stephan_bauer@gmx.de> writes:
> CREATE TABLE anzeigen (
> ...
>         name                    varchar(30) NOT NULL,
> ...
> );

> The following statement _will_ be inserted:

> INSERT INTO anzeigen ( ... name ...) 
> VALUES ( ..., '', ...);

> What is my problem?

An empty string '' is quite different from a NULL.

If you want to forbid empty strings you could add a constraint
expression, eg, CHECK (name <> '').
        regards, tom lane