Triggers automate actions based on database events from "summary" of SQL and Relational Theory by C. Date
Triggers are a key feature of SQL - a way to automate actions based on database events. The basic idea is that you can define a trigger on a table, specifying that certain actions should be taken whenever a specified event occurs on that table. For example, you might define a trigger that says, "whenever a row is inserted into this table, also insert a corresponding row into that table over there." Or you might define a trigger that says, "whenever a row is deleted from this table, also delet...
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