Thread: How to search using daterange (using gist)

Am 16.05.19 um 11:57 schrieb Winanjaya Amijoyo:
> Hi All,
>
> I have records as below that I inserted using exclusion gist constraint
>
> user_id    start_date      end_date         pid
> 001          2019-01-01    2019-02-10        1
> 001          2019-02-01    2019-03-12        2
> 001          2019-03-05    2019-06-15        3
>
> I need to find records based on date range, so for example:
>
> if I search using parameters 001, 2019-01-10, 2019-02-11 .. it will 
> found as pid 1
> if I search using parameters 001, 2019-03-10, 2019-07-13 .. it will 
> found as pid 3
> but if I search out of the date range, for example:
> if I search using parameters 001, 2019-07-10, 2019-09-13 .. it will 
> not found as pid 0
>
> how to search with the above scenario in postgresql?
>
>

can you please show us the table-definition? Are you sure there is an 
exclusion constraint?

with your data:

test=*# select * from demo;
  user_id | start_date |  end_date  | pid
---------+------------+------------+-----
        1 | 2019-01-01 | 2019-02-10 |   1
        1 | 2019-02-01 | 2019-03-12 |   2
        1 | 2019-03-05 | 2019-06-15 |   3
(3 rows)

test=*# select * from demo where daterange(start_date, end_date,'[)') && 
daterange('2019-01-10','2019-02-11');
  user_id | start_date |  end_date  | pid
---------+------------+------------+-----
        1 | 2019-01-01 | 2019-02-10 |   1
        1 | 2019-02-01 | 2019-03-12 |   2
(2 rows)

test=*# select * from demo where daterange(start_date, end_date,'[)') && 
daterange('2019-03-10','2019-07-13');
  user_id | start_date |  end_date  | pid
---------+------------+------------+-----
        1 | 2019-02-01 | 2019-03-12 |   2
        1 | 2019-03-05 | 2019-06-15 |   3
(2 rows)

test=*# select * from demo where daterange(start_date, end_date,'[)') && 
daterange('2019-07-10','2019-09-13');
  user_id | start_date | end_date | pid
---------+------------+----------+-----
(0 rows)

test=*#

test=*# \d demo
                   Table "public.demo"
    Column   |  Type   | Collation | Nullable | Default
------------+---------+-----------+----------+---------
  user_id    | integer |           |          |
  start_date | date    |           |          |
  end_date   | date    |           |          |
  pid        | integer |           |          |

test=*#


Regards, Andreas



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