您需要更改表定义并添加一些check约束：
CREATE TABLE schedule (
id serial primary key,
during tsrange not null check(
(lower(during)::date = upper(during)::date) and
(date_trunc('hour', upper(during)) + INTERVAL '30 min' * ROUND(date_part('minute', upper(during)) / 30.0) = upper(during)) and
(date_trunc('hour', lower(during)) + INTERVAL '30 min' * ROUND(date_part('minute', lower(during)) / 30.0) = lower(during)) and
(lower(during)::time >= '8:00'::time and upper(during)::time <= '18:00'::time) and
(date_part('dow', lower(during)) in (1,2,3,4,5) and date_part('dow', upper(during)) in (1,2,3,4,5))
),
EXCLUDE USING gist (during WITH &&)
);
支票按此顺序
我们需要在holiday表中添加一些内容：将其插入假日值（‘2012-11-28’）;
check 不能引用其他表，因此我们需要触发函数（最好将所有检查都放到该函数中，例如将它们放在一个位置）：
create function holiday_check() returns trigger language plpgsql stable as $$
begin
if exists (select * from holiday where day in (lower(NEW.during)::date, upper(NEW.during)::date)) then
raise exception 'public holiday';
else
return NEW;
end if;
end;
$$;
然后我们需要在insert/之前创建触发器update：
create trigger holiday_check_i before insert on schedule for each row execute procedure holiday_check();
create trigger holiday_check_u before update on schedule for each row execute procedure holiday_check();
最后，进行一些测试：
-- OK
insert into schedule(during) values (tsrange('2012-11-26 08:00', '2012-11-26 09:00'));
INSERT 0 1
-- out of business hours
insert into schedule(during) values (tsrange('2012-11-26 04:00', '2012-11-26 05:00'));
ERROR: new row for relation "schedule" violates check constraint "schedule_during_check"
DETAIL: Failing row contains (12, ["2012-11-26 04:00:00","2012-11-26 05:00:00")).
-- End time can be only 8:30, 9:00, 9:30, ... 16:00, 16:30, 17:00, 17:30 or 18:00 exclusive
insert into schedule(during) values (tsrange('2012-11-26 08:00', '2012-11-26 09:10'));
ERROR: new row for relation "schedule" violates check constraint "schedule_during_check"
DETAIL: Failing row contains (13, ["2012-11-26 08:00:00","2012-11-26 09:10:00")).
-- Start time can be only 8:00 , 8:30, 9:00, 9:30, ... 16:00, 16:30, 17:00 or 17:30 inclusive
insert into schedule(during) values (tsrange('2012-11-26 11:24', '2012-11-26 13:00'));
ERROR: new row for relation "schedule" violates check constraint "schedule_during_check"
DETAIL: Failing row contains (14, ["2012-11-26 11:24:00","2012-11-26 13:00:00")).
-- holiday
insert into schedule(during) values (tsrange('2012-11-28 10:00', '2012-11-28 13:00'));
ERROR: public holiday
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