Re: Howto retrieve all the grandchildren of all the - Mailing list pgsql-general

On Fri, 2002-01-25 at 15:13, Joost Kraaijeveld wrote:
> I have three tables. Table 1 contains the root of a tree. Table 2 contains
> the children of table 1 (column acting as foreign key). Table 3 contains the
> children of table 2 (column acting as foreign key). Basically it contains a
> three level n-ary tree.
>
> Is it possible to retrieve the grandchildren if I have the primary key of a
> record in table 1, assuming that each table has a primary key and an
> appropriate foreign key, and if so, what should be the SQL syntax to do so?

SELECT table3.*
  FROM table3
     , table2
     , table1
 WHERE table3.parent = table2.id
   AND table2.parent = table1.id
   AND table1.id = 123456

-jwb