Answer :
A trigger is a special kind of procedure that executes, or fires, in response to an action query.
Action queries are queries that have the ability to simultaneously add, modify, and delete multiple records. The additional advantage is that Access allows you to preview the query results before executing them. Action Queries in Microsoft Access come in 4 varieties.
Action queries can be used to update records, create new records, create new tables, delete rows from existing tables, and more. As opposed to select queries, which can only edit a single record at a time, action queries can alter many records simultaneously.
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