bangh <banghe(at)baileylink(dot)net> writes:
> while if you use type timestamp, instead of datetime
> timestampField = timestampField - '30minutes'::interval
> you will get error msg.:
> No such function 'datetime_stamp' with the specified attributes
I see no such problem in either 7.0 or 7.1 ...
regression=# create table foo1 (f1 timestamp);
CREATE
regression=# insert into foo1 values(now());
INSERT 832069 1
regression=# update foo1 set f1 = f1 - '30minutes'::interval;
UPDATE 1
regression=#
regards, tom lane