SpatiaLite Database Triggers
As in any database out there, triggers help automate work and make things more fun. In QGIS, SpatiaLite databases play an important role in storing spatial layers that can be used directly in a QGIS project or even accesses by many users over a connection.
Add triggers in your SpatiaLite layers and work like a guru.
To see how SpatiaLite databases are set up and used, checkout • QGIS: SpatiaLite Databases
If you need this guide in a written format, check out http://lifeingis.com/adding-triggers-...
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