IF EXISTS (SELECT 1 FROM inserted)
IF EXISTS (SELECT 1 FROM deleted)
PRINT 'Is Update'
PRINT 'Is Insert'
PRINT 'Is Delete'
Basically, if there are rows in both inserted and deleted, it's an update. If there are rows only in inserted, it's an insert. If there are rows only in deleted, it's a delete.
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)SQL In The Wild
: Discussions on DB performance with occasional diversions into recoverability
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