Re: create index on a field of udt

Hello

I am not sure it is that simple. Probably you need to create operator classes to be used for indexing.

http://www.postgresql.org/docs/9.4/static/xtypes.html

You are probably better off using the basic data type in your table and using a composite index.

Bye

Charles

From: pgsql-general-owner(at)postgresql(dot)org [mailto:pgsql-general-owner(at)postgresql(dot)org] On Behalf Of John R Pierce
Sent: Montag, 29. Juni 2015 07:51
To: pgsql-general(at)postgresql(dot)org
Subject: Re: [GENERAL] create index on a field of udt

On 6/28/2015 10:31 PM, Shujie Shang wrote:

Oh, I didn't explain my question well, actually I want to create an index on an udt in a table.

e.g.

create type info as (id int, name text);

creat table test (i info);

I want to run:

create index myindex on test (i.id <http://i.id> )

create table test of info primary key(id);

or, if you want to use your type plus other stuff in the table, I believe its something like...

create table test (i info, stuff...) primary key (i.id)
or
create index test(i.id);

watch out for ambiguity if the type names match the table or field name. see http://www.postgresql.org/docs/current/static/rowtypes.html#AEN7836

--
john r pierce, recycling bits in santa cruz