On Wed, Aug 7, 2013 at 4:57 AM, Sameer Thakur <samthakur74@xxxxxxxxx> wrote: > I wanted to create a composite datatype to represent a Node. So it would > have a few attributes and an array of type Node which is the children of > this node. > create type Node as (r integer, s integer, children Node []); > But i get error type Node[] does not exist. I understand that Node is not > defined hence the error. > But how do i get around this problem? I just wonder how are you going to use this kind of types? In 9.3 you will be able to use foreign keys with arrays like it is describe here http://blog.2ndquadrant.com/postgresql-9-3-development-array-element-foreign-keys/ eg. create table node as ( id integer primary key, r integer, s integer, children integer[] element references node ); so you could download 9.3rc2 and experimant with it. Now (on <=9.2.x) you can create the table without FK create table node as ( id integer primary key, r integer, s integer, children integer[] ); and check integrity by triggers. -- Kind regards, Sergey Konoplev PostgreSQL Consultant and DBA http://www.linkedin.com/in/grayhemp +1 (415) 867-9984, +7 (901) 903-0499, +7 (988) 888-1979 gray.ru@xxxxxxxxx -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
