Urgent : Update() Function

IF OBJECT_ID('dbo.TestTrigger') IS NOT NULL
BEGIN
DROP TABLE dbo.TestTrigger
IF OBJECT_ID('dbo.TestTrigger') IS NOT NULL
PRINT '<<< FAILED DROPPING TABLE dbo.TestTrigger >>>'
ELSE
PRINT '<<< DROPPED TABLE dbo.TestTrigger >>>'
END
go
CREATE TABLE dbo.TestTrigger
(
colA int NULL,
colB int NULL
)
go
IF OBJECT_ID('dbo.TestTrigger') IS NOT NULL
PRINT '<<< CREATED TABLE dbo.TestTrigger >>>'
ELSE
PRINT '<<< FAILED CREATING TABLE dbo.TestTrigger >>>'
go


IF OBJECT_ID('dbo.TestTrigger_i') IS NOT NULL
BEGIN
DROP TRIGGER dbo.TestTrigger_i
IF OBJECT_ID('dbo.TestTrigger_i') IS NOT NULL
PRINT '<<< FAILED DROPPING TRIGGER dbo.TestTrigger_i >>>'
ELSE
PRINT '<<< DROPPED TRIGGER dbo.TestTrigger_i >>>'
END
go
CREATE TRIGGER dbo.TestTrigger_i
ON dbo.TestTrigger
FOR INSERT AS

IF UPDATE(colA)
select "updating col A"

IF UPDATE(colB)
select "updating col B"

go
go
IF OBJECT_ID('dbo.TestTrigger_i') IS NOT NULL
PRINT '<<< CREATED TRIGGER dbo.TestTrigger_i >>>'
ELSE
PRINT '<<< FAILED CREATING TRIGGER dbo.TestTrigger_i >>>'
go



insert into TestTrigger
(colA)
values
(1)
go

insert into TestTrigger
(colA, colB)
values
(2,3)
go