There is no difference, they do the same thing.
CREATE TRIGGER trgTable on dbo.Table FOR INSERT,UPDATE,DELETE
Is the same as
CREATE TRIGGER trgTable on dbo.Table AFTER INSERT,UPDATE,DELETE
An INSTEAD OF
trigger is different, and fires before and instead of the insert and can be used on views, in order to insert the appropriate values into the underlying tables.
与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…