agora inbox for pgsql-sql@postgresql.org  

help / color / mirror / Atom feed

From: DerekW <derek@cmainfo.co.za>
To: pgsql-sql@postgresql.org
Subject: Re: PostgreSQL add id column that increments based on data
Date: Mon, 4 Aug 2014 01:35:18 -0700 (PDT)
Message-ID: <1407141318770-5813661.post@n5.nabble.com> (raw)
In-Reply-To: <1406909569687-5813543.post@n5.nabble.com>
References: <1406884541460-5813514.post@n5.nabble.com>
	<1406909569687-5813543.post@n5.nabble.com>
List-Unsubscribe: <mailto:majordomo@postgresql.org?body=unsub%20pgsql-sql>

Thank you for the input.

I have come up with the following solution:

CREATE TABLE data_raw (
    raw_data TEXT
);

COPY data_raw FROM 'C:\path\data_x.txt' ...; -- Repeated for each file

ALTER TABLE data_raw
    ADD COLUMN pk_id serial,
    ADD COLUMN id integer,
    ADD COLUMN indicator integer;

UPDATE data_raw SET
    indicator = CAST(substr(raw_data, 1, 1) AS integer),
    raw_data = substr(raw_data, 2);

CREATE TABLE id_base AS
SELECT
    pk_id,
    sum(CASE WHEN indicator = 1 THEN 1 ELSE 0 END) OVER (ORDER BY pk_id) AS
rec_id
FROM data_raw;

CREATE INDEX id_base_pk ON id_base USING btree(pk_id);

UPDATE data_raw r SET
    id = (SELECT rec_id FROM id_base b WHERE b.pk_id = r.pk_id);

DROP TABLE id_base;





--
View this message in context: http://postgresql.1045698.n5.nabble.com/PostgreSQL-add-id-column-that-increments-based-on-data-tp581...
Sent from the PostgreSQL - sql mailing list archive at Nabble.com.


-- 
Sent via pgsql-sql mailing list (pgsql-sql@postgresql.org)
To make changes to your subscription:
http://www.postgresql.org/mailpref/pgsql-sql

view thread (5+ messages)

Message-ID: <1407141318770-5813661.post@n5.nabble.com>
Permalink:  ../1407141318770-5813661.post@n5.nabble.com/
Also on:    postgresql.org/message-id/1407141318770-5813661.post@n5.nabble.com

reply

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Reply to all the recipients using the --to and --cc options:
  reply via email

  To: pgsql-sql@postgresql.org
  Cc: derek@cmainfo.co.za
  Subject: Re: PostgreSQL add id column that increments based on data
  In-Reply-To: <1407141318770-5813661.post@n5.nabble.com>

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

This inbox is served by agora; see mirroring instructions
for how to clone and mirror all data and code used for this inbox