Update Trigger, set value for the inserted data SQL Server - sql-server

Question

I need to create a trigger, if update is assigning a user. And we have not set the value before.
I have this but server doesn't like it.... I get an error
Incorrect syntax near '.'
on the 'set' line.
CREATE TRIGGER dbo.trgIssueAcknowledged
ON dbo.hdIssues
AFTER UPDATE
AS
BEGIN
-- SET NOCOUNT ON added to prevent extra result sets from
-- interfering with SELECT statements.
SET NOCOUNT ON;
If (select inserted.AssignedToUserID from inserted) IS NULL
begin
return
end
If (select inserted.AssignedToUserID from inserted) = 0
begin
return
end
If (select inserted.AcknowledgeDate from inserted) IS NULL
begin
set inserted.AcknowledgeDate = GETDATE ( );
end
END
GO

Answer 1

Your trigger has many issues, it doesn't use the real table you want to update, it assumes only one row is modified every time, and the logic with the RETURN is too weird.
CREATE TRIGGER dbo.trgIssueAcknowledged
ON dbo.hdIssues
AFTER UPDATE
AS
BEGIN
-- SET NOCOUNT ON added to prevent extra result sets from
-- interfering with SELECT statements.
SET NOCOUNT ON;
UPDATE A
SET A.AcknowledgeDate = GETDATE()
FROM dbo.hdIssues A
INNER JOIN INSERTED I
ON A.TheKeyOfTheTable = I.TheKeyOfTheTable
WHERE A.AcknowledgeDate IS NULL
AND ( A.AssignedToUserID <> 0 AND A.AssignedToUserID IS NOT NULL)
END

Answer 2

Could it perhaps be the spelling mistake?
inserted.AcknoledgeDate
looks like it is missing "w"
should be
inserted.AcknowledgeDate

Answer 3

Try This
CREATE TRIGGER dbo.trgIssueAcknowledged ON dbo.hdIssues
AFTER INSERT, DELETE, UPDATE
AS
BEGIN
SET NOCOUNT ON;
BEGIN TRY
DECLARE #INSERTCOUNT INT
DECLARE #DELETECOUNT INT
SET #INSERTCOUNT = ( SELECT COUNT(*)
FROM INSERTED
)
SET #DELETECOUNT = ( SELECT COUNT(*)
FROM DELETED
)
IF #INSERTCOUNT > 0
AND #DELETECOUNT = 0
BEGIN
-- Insert statements for trigger here
INSERT INTO dbo.hdIssues
( col1, col2)
SELECT I.col1,
I.col2
FROM INSERTED I
END
ELSE
IF #INSERTCOUNT > 0
AND #DELETECOUNT > 0
BEGIN
INSERT INTO dbo.hdIssues
( col1, col2)
SELECT I.col1,
I.col2
FROM INSERTED I
INNER JOIN DELETED D ON I.col1 = D.col1
WHERE I.col1 <> D.col1
OR
I.col2 <> D.col2
END
END TRY
BEGIN CATCH
END CATCH
END
GO

Answer 4

Well first of all inserted is a virtual table, so if you want to update one of the columns, you need to do an UPDATE.
UPDATE inserted
set AcknowledgeDate = GETDATE ( )
WHERE AcknowledgeDate IS NULL;
But second of all, why do you want to update the value in the inserted table in an AFTER UPDATE trigger? What are you really trying to do?