First and Last time with Night Labor time - postgresql

Question

I have this issue.
These are the data that I have in the sample (I have more people and more times):
CREATE TABLE table_times(id,date_time,name)
AS ( VALUES
( 1000004, '2018-08-22 11:11'::timestamp without time zone, 'Carlos Eduardo' ),
( 1000004, '2018-08-22 11:43', 'Carlos Eduardo' ),
( 1000004, '2018-08-22 11:48', 'Carlos Eduardo' ),
( 1000004, '2018-08-22 11:54', 'Carlos Eduardo' ),
( 1000004, '2018-08-22 17:52', 'Carlos Eduardo' ),
( 1000004, '2018-08-23 08:13', 'Carlos Eduardo' ),
( 1000004, '2018-08-23 08:28', 'Carlos Eduardo' ),
( 1000004, '2018-08-23 10:25', 'Carlos Eduardo' ),
( 1000004, '2018-08-23 10:25', 'Carlos Eduardo' ),
( 1000004, '2018-08-23 10:25', 'Carlos Eduardo' ),
( 1000004, '2018-08-23 13:30', 'Carlos Eduardo' ),
( 1000004, '2018-08-24 22:20', 'Carlos Eduardo' ),
( 1000004, '2018-08-24 23:27', 'Carlos Eduardo' ),
( 1000004, '2018-08-25 03:14', 'Carlos Eduardo' ),
( 1000004, '2018-08-25 05:12', 'Carlos Eduardo' )
);
And I'm trying to find this:
id start end name
-------+-------------------+-------------------+--------------
1000004 2018-08-22 11:11:00 2018-08-22 17:52:00 Carlos Eduardo
1000004 2018-08-23 08:13:00 2018-08-23 13:30:00 Carlos Eduardo
1000004 2018-08-24 22:20:00 2018-08-25 05:12:00 Carlos Eduardo
I need to organize these data per date, like the days 22, 23 and organize the time when start at night and finish at morning, like 24 and 25.
I have some other people and they don't have a specific labor time then I need to get the time by these data. Besides that, I have just these data to organize and the maximum of 14 labor hours per day.
I tried the query below, but when the labor time is at night, it doesn't work.
SELECT
id,
MIN(date_time) AS start,
MAX(date_time) AS end,
name
FROM
table_times
GROUP BY
id
, name
, EXTRACT(DAY FROM date_time)
, EXTRACT(MONTH FROM date_time)
, EXTRACT(YEAR FROM date_time)
ORDER BY name, start ASC
May anyone help me?
PS: Sorry my poor english.

Answer 1

In order to make your problem tractable, we will need to define the boundaries for a shift. In this answer, I assume that you have two kinds of shifts. Day shifts, which start after 06:00 and end before 22:00, always occur within the same calendar day. Night shifts, which start after 22:00 and end before 06:00, wrap around across two days.
I employ an accounting trick below, by which I treat all night shift timestamps as logically belonging to the same starting date. This allows us to handle your boundary conditions.
WITH cte AS (
SELECT
id,
date_time,
name,
CASE WHEN EXTRACT(HOUR FROM date_time) >= 22 OR EXTRACT(HOUR FROM date_time) <= 6
THEN 1 ELSE 0 END AS shift,
CASE WHEN EXTRACT(HOUR FROM date_time) <= 6
THEN date_time::date - INTERVAL '1 DAY'
ELSE date_time::date END AS logical_date
FROM table_times
)
SELECT
id,
MIN(date_time) AS start,
MAX(date_time) AS end,
name
FROM cte
GROUP BY
id,
shift,
name,
logical_date
ORDER BY
name,
start;
Demo