Обсуждение: BUG #7653: Minor problem with join condition

The following bug has been logged on the website:

Bug reference:      7653
Logged by:          Stefano Baccianella
Email address:      stefano@sportilia.com
PostgreSQL version: 9.2.1
Operating system:   Linux CentOS
Description:        =


Don't know if this is a bug or a correct behaviour, but in a query like
this:

SELECT t1.* FROM
table1 t1 JOIN
table2 t2 ON t1.id =3D t2.t1id JOIN
table3 t3 ON t1.id =3D t2.t1id

The parser should return an error because we are joining a table without
using any of its column.

I know this is a minor issue and a correct SQL syntax, but logically a JOIN
without condition is a Cartesian product between the two tables and not a
JOIN.
My proposal is to raise an error when a join condition doesn't contains the
table reference.

Regards

stefano@sportilia.com writes:
> Don't know if this is a bug or a correct behaviour, but in a query like
> this:

> SELECT t1.* FROM
> table1 t1 JOIN
> table2 t2 ON t1.id = t2.t1id JOIN
> table3 t3 ON t1.id = t2.t1id

> The parser should return an error because we are joining a table without
> using any of its column.

There is no such restriction in the SQL standard.

            regards, tom lane