INSTEAD OF triggers can only be created on Views. For a table, you can create BEFORE or AFTER triggers. In fact, you can create four different types of triggers on tables, depending on your requirements:As for your requirement, if you want to prohibit inserting into a table, don't use a trigger.NSTEAD OF triggers can only be created on Views. For a table, you can create BEFORE or AFTER triggers. In fact, you can create four different types of triggers on tables, depending on your requirements: