To: pgsql-admin@postgresql.org
From: Christian Ullrich <chris@chrullrich.net>
Subject: Re: CREATE TABLE LIKE and tablespaces
Date: Sat, 02 Mar 2013 19:40:42 +0100
Lines: 56
Message-ID: <kgth37$aup$1@ger.gmane.org>
References: <20130227132935.44fc25f1@hydrogen.roaringpenguin.com>
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* David F. Skoll wrote:

> I have an application that creates a daily table from a "prototype"
> table, so something like:
>
> CREATE TABLE data_20130226 LIKE data_prototype INCLUDING DEFAULTS INCLUDING CONSTRATINTS INCLUDING INDEXES;
>
> It would be really nice to be able to add:
>
> INCLUDING TABLESPACE

Workaround:

CREATE OR REPLACE FUNCTION table_tablespace(p_relname regclass)
	RETURNS name
	LANGUAGE sql
	AS $$
SELECT t.spcname
   FROM pg_class c
   JOIN pg_tablespace t
     ON (c.oid = p_relname
	AND COALESCE(
	    NULLIF(c.reltablespace, 0),
	    (SELECT dattablespace
	       FROM pg_database
	      WHERE datname = current_database())) = t.oid);
$$;

-- It is surprisingly difficult to get the tablespace of a table.
-- (Note to self: So *that* is what NULLIF() is for!)

CREATE OR REPLACE FUNCTION create_table_like(p_old regclass, p_new name)
	RETURNS regclass
	LANGUAGE plpgsql
	AS $$
BEGIN
     EXECUTE 'CREATE TABLE ' || quote_ident(p_new)
         || ' (LIKE ' || quote_ident(p_old::name)
         || ' INCLUDING DEFAULTS '
         || ' INCLUDING CONSTRAINTS '
         || ' INCLUDING INDEXES) '
         || ' TABLESPACE '|| quote_ident(table_tablespace(p_old))
         || ';';
     RETURN p_new::regclass;
END;
$$;

test=> SELECT create_table_like('data_prototype', 'data_20130226');
  create_table_like
-------------------
  data_20130226


-- 
Christian


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