Re: Intervals and ISO 8601 duration

> Thanks Tom! That helped me spell it out and understand it a little more
> clearly. Both to understand the non-identicalness, and to see the
> specifics. But yeah it would be nice if it was a little easier to extract!
> :)
>
> WITH foo AS (
> WITH inters AS (
> SELECT
> '1 day 2 hours'::interval AS i1,
> '26 hours'::interval AS i2
> )
> SELECT
> *,
> EXTRACT(YEARS FROM i1)*12 + EXTRACT(MONTHS FROM i1) AS i1_months,
> EXTRACT(DAYS FROM i1) AS i1_days,
> EXTRACT(HOURS FROM i1) * 60 * 60 * 1000
> + EXTRACT(MINUTES FROM i1) * 60 * 1000
> + EXTRACT(SECONDS FROM i1) * 1000
> + EXTRACT(MICROSECONDS FROM i1)
> AS i1_msec,
> EXTRACT(YEARS FROM i2)*12 + EXTRACT(MONTHS FROM i2) AS i2_months,
> EXTRACT(DAYS FROM i2) AS i2_days,
> EXTRACT(HOURS FROM i2) * 60 * 60 * 1000
> + EXTRACT(MINUTES FROM i2) * 60 * 1000
> + EXTRACT(SECONDS FROM i2) * 1000
> + EXTRACT(MICROSECONDS FROM i2)
> AS i2_msec,
> i1=i2 AS equals
> FROM inters
> )
> SELECT
> *,
> (i1_months=i2_months AND i1_days=i2_days AND i1_msec=i2_msec) AS
> identical,
> i1_months * 30 * 24 * 60 * 60 * 1000
> + i1_days * 24 * 60 * 60 * 1000
> + i1_msec AS i1_msec_total,
> i2_months * 30 * 24 * 60 * 60 * 1000
> + i2_days * 24 * 60 * 60 * 1000
> + i2_msec AS i2_msec_total
>
> FROM foo;
>
> -[ RECORD 1 ]-+---------------
> i1 | 1 day 02:00:00
> i2 | 26:00:00
> i1_months | 0
> i1_days | 1
> i1_msec | 7200000
> i2_months | 0
> i2_days | 0
> i2_msec | 93600000
> equals | t
> identical | f
> i1_msec_total | 93600000
> i2_msec_total | 93600000

I am not sure if I fully understand what you want to do here but I
guess you can extract "93600000" part easier using "EPOCH" of EXTRACT
function.

SELECT EXTRACT(EPOCH FROM i1) AS epoch_i1, EXTRACT(EPOCH FROM i2) AS epoch_i2
FROM ( SELECT '1 day 2 hours'::interval AS i1, '26 hours'::interval AS i2) AS s;

epoch_i1 | epoch_i2
--------------+--------------
93600.000000 | 93600.000000
(1 row)

Best reagards,
--
Tatsuo Ishii
SRA OSS LLC
English: http://www.sraoss.co.jp/index_en/
Japanese:http://www.sraoss.co.jp