10
create unique index tttest_idx on tttest (price_id,price_off);
11
alter table tttest add column q1 text;
12
alter table tttest add column q2 int;
13
alter table tttest drop column q1;
15
create trigger timetravel
16
before insert or delete or update on tttest
19
timetravel (price_on, price_off);
21
insert into tttest values (1, 1, null, null);
22
insert into tttest(price_id, price_val) values (2, 2);
23
insert into tttest(price_id, price_val,price_off) values (3, 3, 'infinity');
25
insert into tttest(price_id, price_val,price_off) values (4, 4,
26
abstime('now'::timestamp - '100 days'::interval));
27
insert into tttest(price_id, price_val,price_on) values (3, 3, 'infinity'); -- duplicate key
30
delete from tttest where price_id = 2;
35
select * from tttest where price_off = 'infinity';
37
-- change price for price_id == 3
38
update tttest set price_val = 30 where price_id = 3;
41
-- now we want to change price_id from 3 to 5 in ALL tuples
42
-- but this gets us not what we need
43
update tttest set price_id = 5 where price_id = 3;
46
-- restore data as before last update:
47
select set_timetravel('tttest', 0); -- turn TT OFF!
49
select get_timetravel('tttest'); -- check status
51
delete from tttest where price_id = 5;
52
update tttest set price_off = 'infinity' where price_val = 30;
55
-- and try change price_id now!
56
update tttest set price_id = 5 where price_id = 3;
58
-- isn't it what we need ?
60
select set_timetravel('tttest', 1); -- turn TT ON!
62
select get_timetravel('tttest'); -- check status
64
-- we want to correct some date
65
update tttest set price_on = 'Jan-01-1990 00:00:01' where price_id = 5 and
66
price_off <> 'infinity';
67
-- but this doesn't work
70
select set_timetravel('tttest', 0); -- turn TT OFF!
72
select get_timetravel('tttest'); -- check status
74
update tttest set price_on = '01-Jan-1990 00:00:01' where price_id = 5 and
75
price_off <> 'infinity';
77
-- isn't it what we need ?
79
-- get price for price_id == 5 as it was '10-Jan-1990'
80
select * from tttest where price_id = 5 and
81
price_on <= '10-Jan-1990' and price_off > '10-Jan-1990';