SQL triggers are less common but can be a great solution for certain situations. I'll provide examples for how to use triggers to enforce data integrity and track changes to a database.
SQL Triggers, also called Database Triggers, allow you to tell your SQL engine (for these examples, Postgres) to run a piece of code when an event happens, or even before the event.
SQL stands for Structured Query Language. SQL is a scripting language expected to store, control, and inquiry information put away in social databases. The main manifestation of SQL showed up in 1974, when a gathering in IBM built up the principal model of a social database. The primary business social database was discharged by Relational Software later turning out to be Oracle.
SQL Triggers, also called Database Triggers, allow you to tell your SQL engine (for these examples, Postgres) to run a piece of code when an event happens, or even before the event. We'll learn everything there is to know about SQL Triggers in PostgreSQL in this article.
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SQL trigger is a stored program that invoked by the database automatically when any change in the event occurs. Trigger is different from stored procedures.
SQL Trigger differ from stored procedures in that they are not called directly by the user: when a certain event occurs in the table, they are executed.