Postgresql – How to do Postgresql 9.2 version check in Linux

1. Start by commenting out the offending line in your postgresql.conf and retry. It is possible that a change made some time ago caused this problem and you are only now seeing it because a reload operation or similar failed, and so PostgreSQL was running on old configuration. If that works address what you have on that line (maybe get rid of the quotes?)

2. If that doesn't work, take a look elsewhere in the file. Maybe you have an unterminated quote somewhere?

It really looks to me like you have a bad postgresql.conf file and that's why it isn't starting.

There are probably better ways to do this, but here are a few functions to return days or intervals from a tstzrange/tsrange input parameter.

CREATE OR REPLACE FUNCTION extract_interval(TSTZRANGE) RETURNS interval AS
$func$
select upper($1) - lower($1);
$func$ LANGUAGE sql STABLE;

CREATE OR REPLACE FUNCTION extract_interval(TSRANGE) RETURNS interval AS
$func$
select upper($1) - lower($1);
$func$ LANGUAGE sql STABLE;


CREATE OR REPLACE FUNCTION extract_days(TSTZRANGE) RETURNS integer AS
$func$
select (date_trunc('day',upper($1))::DATE - date_trunc('day',lower($1))::DATE) + 1;
$func$ LANGUAGE sql;

CREATE OR REPLACE FUNCTION extract_days(TSRANGE) RETURNS integer AS
$func$
select (date_trunc('day',upper($1))::DATE - date_trunc('day',lower($1))::DATE) + 1;
$func$ LANGUAGE sql;


WITH tzr AS (SELECT tstzrange('2013-10-01 10:00-07', '2013-10-03 05:15-07') AS dttz, tstzrange('2013-10-01 10:00', '2013-10-03 05:15') AS dt)
SELECT  extract_interval(dttz) as interval_with_tz,
        extract_interval(dt) as interval_no_tz,
        extract_days(dttz) as days_with_tz,
        extract_days(dt) as days_no_tz
FROM tzr;

                      tstzrange                      | interval_with_tz | interval_no_tz | days_with_tz | days_no_tz 
-----------------------------------------------------+------------------+----------------+--------------+------------
 ["2013-10-01 07:00:00-07","2013-10-01 07:15:00-07") | 00:15:00         | 00:15:00       |            1 |          1

Edit: I have put up these functions on the Postgresql Wiki so that others can use or edit them if more efficient versions are developed. https://wiki.postgresql.org/wiki/Extract_days_from_range_type