Re: How to disable duplicate columns

On 4/8/07, Andrus <kobruleht2(at)hot(dot)ee> wrote:
> I have tables with large number of columns some of which are duplicate.
> I need to use
>
> SELECT t1.*, t2.* FROM t1 join t2 using (t)
>
> since I don't know all column names of t1 and t2 tables at design time.
>
> In this case PostgreSQL returns table with duplicate columns.
> How to force Postgres to return only first table column when second table
> contains column with same name?

use can use a natural join:

select * from t1 natural join t2;

this will essentially look for columns that are in both tables, and do
an implicit 'using' on those columns.

be warned, this can lead to surprising behavior -- it only works if
you *want* identically named fields to be part of the join condition,
otherwise the results are undefined.

merlin