How to use multiple triggers? - sql

Question

DROP TRIGGER IF EXISTS N2Trigger
CREATE TRIGGER N2Trigger
ON dbo.Date
FOR INSERT, DELETE
AS
BEGIN
SELECT 'Inserted Datebase' as MESSAGE
SELECT 'Deleted Database' as MESSAGE
END
DELETE FROM dbo.[Date] WHERE ID = 1
Here is my code I just want when I use insert statement return 'Inserted Datebase' as MESSAGE
When I use delete statement return 'Deleted Database' as MESSAGE

Answer 1

The easiest way to check what action fired the trigger is to inspect the inserted and deleted pseudo-tables. If the trigger is only on DELETE/INSERT and not on update, then the logic is simply:
CREATE TRIGGER dbo.trFlarb ON dbo.flarb
FOR INSERT, DELETE
AS
BEGIN
IF EXISTS (SELECT 1 FROM inserted)
BEGIN
SELECT 'Inserted.';
END
IF EXISTS (SELECT 1 FROM deleted)
BEGIN
SELECT 'Deleted.';
END
END
Example db<>fiddle
Now, of course, Marc is right: triggers aren't for returning or printing output. This is just a demonstration that you can use those checks to then perform whatever logic you need to perform in the event of either action.
That said, if you have two distinctly different things you want to do depending on whether it's an insert or a delete, why not just create two separate triggers?
CREATE TRIGGER dbo.tr_I_Flarb ON dbo.flarb
FOR INSERT
AS
BEGIN
SELECT 'Inserted.';
END
GO
CREATE TRIGGER dbo.tr_D_Flarb ON dbo.flarb
FOR DELETE
AS
BEGIN
SELECT 'Deleted.';
END
GO
Note that SELECT will only "work" on your system if you haven't turned on the disallow results from triggers Server Configuration Option. Again, you should try to explain what you really want to do in the event of an insert or update, because the end goal can't be to print or return "Inserted" or "Deleted."