Salut, cum trebuie defapt sa fie?

drop table TEST_LIVE
drop table TEST_HIST
drop view VW_TEST

create table TEST_LIVE(COL1 int, COL2 varchar(20), COL3 datetime)
create table TEST_HIST(COL1 int, COL2 varchar(20), COL3 datetime)

INSERT INTO TEST_HIST SELECT 1,'test 1', '2011-10-10 13:04:14.403'
INSERT INTO TEST_HIST SELECT 2,'test 2', '2011-10-11 13:04:14.403'
INSERT INTO TEST_HIST SELECT 3,'test 3', '2011-10-12 13:04:14.403'
INSERT INTO TEST_HIST SELECT 4,'test 4', '2011-10-13 13:04:14.403'


INSERT INTO TEST_LIVE SELECT 5,'test 5', '2011-10-15 13:04:14.403'
INSERT INTO TEST_LIVE SELECT 6,'test 6', '2011-10-16 13:04:14.403'
INSERT INTO TEST_LIVE SELECT 7,'test 7', '2011-10-17 13:04:14.403'
INSERT INTO TEST_LIVE SELECT 8,'test 8', '2011-10-18 13:04:14.403'
INSERT INTO TEST_LIVE SELECT 9,'test 9', '2011-10-19 13:04:14.403'


alter VIEW dbo.VW_TEST
AS
SELECT * FROM dbo.TEST_LIVE
UNION
SELECT * FROM dbo.TEST_HIST

update a
SET a.COL2 ='test x'
from VW_TEST a where a.COL1 = 1

si primesc eroarea:
Msg 4406, Level 16, State 1, Line 1
Update or insert of view or function 'a' failed because it contains a derived or constant field.

nu se poate face update-ul daca am union in view?