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Any relational database has a variety of logical and procedural objects, some of them quite classic and inherited from other languages, like the scalar function or stored procedure. The scalar function is clearly oriented per row, so it is an atomic object. Apart from the traditional objects, there are database-specific objects, and the trigger is maybe the most common one. As you probably know, there are many types of triggers, such as statement triggers and row triggers. In a way, the row trigger is very similar to the scalar function, because it is a row-oriented object. In this chapter, you will see how row triggers work and how they move the context to the row level whether we like it or not.
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- Chapter 8