People,
Thanks for your help with my problem with NULL values. Also, particular
thanks for a hint on where to find a copy of SQL-92 standard, something
I didn't already have. It was annoying to discover that UNIQUE didn't
have what I felt was the "obvious" meaning, but it doesn't and PostgreSQL
Pavel Stehule wrote:
> its not error. Only SQL specific :-) NULL <> NULL
Au contraire, neither
NULL = NULL
nor
NULL <> NULL
is true.
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Hello,
its not error. Only SQL specific :-) NULL <> NULL
Regards
Pavel Stehule
On Tue, 6 Jul 2004, David Newall wrote:
> PostgreSQL version: 7.4.3 (RPMs from ftp.au.postgresql.org)
>
> Operating Sysem: Fedora Core 1
>
> CREATE TABLE t1 (i INTEGER, j INTEGER);
> INSERT INTO t1 VALUES (1, NULL
On Tue, 6 Jul 2004, David Newall wrote:
> PostgreSQL version: 7.4.3 (RPMs from ftp.au.postgresql.org)
>
> Operating Sysem: Fedora Core 1
>
> CREATE TABLE t1 (i INTEGER, j INTEGER);
> INSERT INTO t1 VALUES (1, NULL);
> CREATE TABLE t2 AS SELECT * FROM t1;
> SELECT * FROM t1 JOIN t2 USING (i, j);
David Newall wrote:
> PostgreSQL version: 7.4.3 (RPMs from ftp.au.postgresql.org)
>
> Operating Sysem: Fedora Core 1
>
> CREATE TABLE t1 (i INTEGER, j INTEGER);
> INSERT INTO t1 VALUES (1, NULL);
> CREATE TABLE t2 AS SELECT * FROM t1;
> SELECT * FROM t1 JOIN t2 USING (i, j);
> i | j
> ---+---
> (
PostgreSQL version: 7.4.3 (RPMs from ftp.au.postgresql.org)
Operating Sysem: Fedora Core 1
CREATE TABLE t1 (i INTEGER, j INTEGER);
INSERT INTO t1 VALUES (1, NULL);
CREATE TABLE t2 AS SELECT * FROM t1;
SELECT * FROM t1 JOIN t2 USING (i, j);
i | j
---+---
(0 rows)
I believe the one row, which is
