Re: How to add column from old_table to new_table?

am  21.09.2005, um 14:36:26 +0200 mailte Joost Kraaijeveld folgendes:
> Hi,
> 
> I have an old_table with two columns: "id" and "old_attribute". I have
> new table with the columns "id" and "new_attribute". 

There are indexes on id?


> Is that possible in a SQL script (pgadmin or psql console?) and if so,
> what is the syntax in this example? 

Yes, of course.

> 
> I have tried something as:
> 
> insert into new_table(new_attribute) 
> value( select old_attribute from old_table, new_table where old_table.id
> = new_table_id)
> where new_table.id = old_table.id

Error, because i don't need a insert on new_table. You need a update!
(If there a primary index on id this will raise a error)


update t_new set name = (select name from t_old) where t_old.id=t_new.id;

(t_old and t_new are the tables with (id, name) similar your example)




Regards, Andreas
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