October 2023
Intermediate to advanced
744 pages
15h 51m
English
Content preview from Learn PostgreSQL - Second Edition
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8
Triggers and Rules
In the previous chapter, we talked about server-side programming. In this chapter, we will use the concepts introduced in the previous chapter to manage the programming of events in PostgreSQL. The first thing we need to address is what an event in PostgreSQL actually is. In PostgreSQL, possible events are given by the SELECT/INSERT/UPDATE, and DELETE statements. There are also events related to data definition language (DDL) operations; however we will talk about those events in Chapter 17, Event Triggers.
In PostgreSQL, there are two ways to handle events:
- Rules
- Triggers
In this chapter, we will explore both of these ways and address when it is more appropriate to use one rather than the other. As a starting point, we ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.