Message-ID: <8cf7a01702a3dae1205e5dcf09b27e083dcd9511.camel@cybertec.at>
Subject: Re: Creating a partition table
From: Laurenz Albe <laurenz.albe@cybertec.at>
To: John Scalia <jayknowsunix@gmail.com>, pgsql-admin
	 <pgsql-admin@postgresql.org>
Date: Fri, 30 Oct 2020 18:01:35 +0100
In-Reply-To: <BFBB87D2-4AFB-4B2A-A140-E19860849936@gmail.com>
References: <BFBB87D2-4AFB-4B2A-A140-E19860849936@gmail.com>
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On Fri, 2020-10-30 at 12:52 -0400, John Scalia wrote:
> I have a PostgreSQL server version 11.3 that my devs are asking for some partitioned tables. I can’t seem to get the syntax correct though. My SQL code is:
> 
> CREATE TABLE schema.temp_table
> AS (SELECT * FROM schema.original_table)
> PARTITION BY LIST(attribute_name);
> 
> As what I want to do is create a copy of the current table, create the partitions on the new temp table, and when everything works, drop the original table and do an alter table rename on the new
> one.
> 
> The error is:
> ERROR: syntax error at or near “PARTITION”
> Line 3: PARTITION BY LIST(attribute_name);
> 
> I’ve tried using the word RANGE as opposed to LIST, but the error remains. Does PostgreSQL not support a construct like this one or am I doing something wrong?

You cannot do that in a single step.  For one, you didn't create partitions.

Do it like this:

CREATE TABLE temp_table (LIKE original_table INCLUDING ALL) PARTITION BY LIST(attribute_name);

CREATE TABLE temp_table_1 PARTITION OF temp_table FOR VALUES IN (1);
CREATE TABLE temp_table_2_3 PARTITION OF temp_table FOR VALUES IN (2, 3);

INSERT INTO temp_table SELECT * FROM original_table;

Yours,
Laurenz Albe
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