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


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