INSERT Triggers

INSERT Triggers

The insert triggers are fired whenever an INSERT operation occurs. They can be executed before or after the insert query is executed. In the insert triggers, we can only use the NEW keyword to access the new values of a column. The OLD keyword cannot be used because there are no previous values for an INSERT statement. The BEFORE INSERT trigger can be used for data validation or for maintaining a summary table of another table. The AFTER INSERT trigger can be used for maintaining an activity log or to copy the values in a table to another table.

Syntax

CREATE TRIGGER trigger_name [BEFORE | AFTER] INSERT

ON table_name

FOR EACH ROW

trigger_body

Connect to the terminal below by clicking in the widget. Once connected, the command line prompt will show up. Enter or copy-paste the command ./DataJek/Lessons/47lesson.sh and wait for the mysql prompt to start-up.