Re: Finding free time period on non-continous tstzrange field values

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От Amitabh Kant
Тема Re: Finding free time period on non-continous tstzrange field values
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Msg-id CAPTAQB++ZfCivCb7FSsDmRrTYvSd2_wJarXjh5EBdp2HO0ACHA@mail.gmail.com
обсуждение исходный текст
Ответ на Finding free time period on non-continous tstzrange field values  (Amitabh Kant <amitabhkant@gmail.com>)
Ответы Re: Finding free time period on non-continous tstzrange field values  (Tom Lane <tgl@sss.pgh.pa.us>)
Список pgsql-general
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On Wed, Nov 30, 2022 at 7:13 PM Amitabh Kant <amitabhkant@gmail.com> wrote:
Hi

Given the following table, how do I find free time period.

CREATE TABLE test_time_range (
    id SERIAL PRIMARY KEY,
    time_range tstzrange);


Insert into test_time_range(time_range) values('[2022-11-28 08:00:00, 2022-11-28 20:00:00]');
Insert into test_time_range(time_range) values('[2022-11-29 12:30:00, 2022-11-29 22:00:00]');
Insert into test_time_range(time_range) values('[2022-11-30 05:00:00, 2022-11-30 19:00:00]');


In the above example, I would like the query to return something like this:
"2022-11-28 20:01:00 2022-11-29 11:29:00"
"2022-11-29 22:01:00 2022-11-30 04:59:00"


Apologies if this is a dumb question, but trying to use range for the first time , and can't get my head around it. 

Using PG14, can upgrade to 15 if that matters.


Amitabh

Based on Marcos suggestions (https://www.crunchydata.com/blog/better-range-types-in-postgres-14-turning-100-lines-of-sql-into-3), I tried the following query :

SELECT tstzmultirange(tstzrange('2022-11-25 00:00:00', '2022-11-30 00:00:00', '[]')) -
  range_agg(time_range) AS availability
FROM test_time_range
WHERE time_range && tstzrange('2022-11-25 00:00:00', '2022-11-30 00:00:00', '[]');

but then I receive the following error. My guess is I need to cast the tstzrange output, but can't seem to find the correct cast.

ERROR: function tstzmultirange(tstzrange) does not exist
LINE 1: SELECT tstzmultirange(tstzrange('2022-11-25 00:00:00', '2022... ^ HINT: No function matches the given name and argument types. You might need to add explicit type casts. SQL state: 42883 Character: 8

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