Question

I have a trigger for auditing purchase and sales table. The trigger is on INSERT and DELETE. To check if its “Insert”, the condition is

IF (SELECT COUNT(*) FROM INSERTED) > 0

BEGIN

END

How do I check if its an Update command inside the Trigger?

Arun

Answer 1

The “tables” that are in play in an update trigger are still called inserted and deleted, and the old values of the rows are in the deleted table, and the new values are in the inserted table.

You can use logic along these lines to detect whether you are in a insert, update or a delete:

CREATE TRIGGER MyTrigger
   ON  MyTable
   AFTER INSERT,DELETE,UPDATE -- you need to add the "update" here, 
                              -- in order to catch updates as well
AS 
BEGIN
    Declare @insertedCount int
    Declare @deletedCount int
    select @insertedCount = COUNT(*) from inserted
    select @deletedCount = COUNT(*) from deleted
    if (@insertedCount != 0) -- we have some new values
      if (@deletedCount = 0)  -- do we have old values?
        print 'Inserting'
      else 
        print 'Updating'
    else
      print 'Deleting'

END