Re: [GENERAL] how to create a new composite type using already existing composite types
On Sat, Feb 13, 2010 at 7:24 PM, Jeff Davis wrote: > On Wed, 2010-02-10 at 03:46 +, Iain Barnett wrote: > >> CREATE TYPE inventory_item2 AS ( >> name text, >> supplier_id integer, >> price numeric, >> size integer >> ); >> >> >> but it would be handy if I could reuse inventory_item instead of >> having to retype the whole lot. I can't work out or find the right >> syntax, can anyone show me how? Any help would be much appreciated. > > What about: > > CREATE TYPE inventory_item2 AS ( > ii inventory_item, > size integer > ); > > or: > > CREATE TABLE inventory_item2 ( > LIKE inventory_item, > size integer > ); Pretty neat. I wasn't aware you could mix LIKE with explicit field declarations. Those expressions produce different results...the first creates a type within a type (nested) and the second creates a new unnested type based on the fields of the original type. The first expression creates a dependency while the second does not. This flexibility is only possible if you create types with the 'create table' statement. merlin -- Sent via pgsql-general mailing list (pgsql-general@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
Re: [GENERAL] how to create a new composite type using already existing composite types
On Wed, 2010-02-10 at 03:46 +, Iain Barnett wrote: > CREATE TYPE inventory_item2 AS ( > nametext, > supplier_id integer, > price numeric, > size integer > ); > > > but it would be handy if I could reuse inventory_item instead of > having to retype the whole lot. I can't work out or find the right > syntax, can anyone show me how? Any help would be much appreciated. What about: CREATE TYPE inventory_item2 AS ( ii inventory_item, size integer ); or: CREATE TABLE inventory_item2 ( LIKE inventory_item, size integer ); and that will automatically create the type. Regards, Jeff Davis -- Sent via pgsql-general mailing list (pgsql-general@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
[GENERAL] how to create a new composite type using already existing composite types
Hi, Is there a way to create a new composite type using already existing composite type? For example, CREATE TABLE inventory_item ( nametext, supplier_id integer REFERENCES suppliers, price numeric CHECK (price > 0) ); produces the following type automatically CREATE TYPE inventory_item AS ( nametext, supplier_id integer, price numeric ); but I'd also like to have a type with an extra column for certain functions CREATE TYPE inventory_item2 AS ( nametext, supplier_id integer, price numeric, sizeinteger ); but it would be handy if I could reuse inventory_item instead of having to retype the whole lot. I can't work out or find the right syntax, can anyone show me how? Any help would be much appreciated. Regards Iain
