SQL Triggers Explained! (Short & Sweet SQL Tutorial)
In this short SQL tutorial we’ll walk you through SQL triggers – you will know what they are, what can they be used for, and how to use them.
A SQL trigger is a SQL database object that contains code to be executed when a certain event occurs.
SQL triggers can be executed either before or after certain events and they have three types:
1) INSERT SQL triggers tell a SQL database that data has been inserted and action needs to be taken.
2) UPDATE SQL triggers telling a SQL database that data has been updated and action needs to be taken.
3) DELETE SQL triggers are fired when data within certain SQL database is deleted.
A SQL trigger can also be row-based or statement-based: row-based SQL triggers are executed once for each row, while statement-based SQL triggers are executed once as a SQL trigger itself.
SQL triggers can be used to automate tasks, enforce ACID compliance, or act as “mini SQL developers” to ensure that the value of a row is never set above or below the number X, etc.
Enjoy the video!
If you’ve found yourself searching for sql triggers, you will certainly find these sql interview questions and answers for experienced developers and DBAs interesting:
Q: Is sql injection very dangerous? How to avoid it?
A: Yes, sql injection is a very dangerous security flaw. To avoid sql injection, avoid passing user input straight to a database.
Q: How does a sql index improve sql query performance?
A: A sql index improves database performance by acting as an “index” in a book: by using a sql index your database knows how to find your data in a quick fashion. If you’re after a sql indexes explained video we advise you watch one of our videos on a sql index and its performance.
Q: Explain sql in 100 seconds.
A: SQL is a programming language allowing for work with various RDBMS including mysql server, mariadb server, percona server, and others.
Q: Are sql interview questions for experienced developers and DBAs very difficult?
A: No, these sql interview questions for experienced DBAs aren’t very complex for a DBA worth their salt.
Q: Explain sql joins.
A: sql joins are used to combine rows from a couple of tables in a database management system.
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